Backing bearings

SKF backing bearings are also available in many designs and variants. The principal assortment is based on double or three-row cylindrical roller bearings. Single row needle roller bearing and double row tapered roller bearing designs are also available.

Backing bearings have been specially developed for cold rolling mills of the cluster type. But can also be used for other applications, for example straightening or bending machines. These bearings have a particularly thick-walled outer ring and can be mounted on stationary support shafts to form backup or straightening rolls. 

• High load carrying capacity
• Low friction
  The optimized internal geometry reduces friction and heat generated by the bearing.
• Long service life
  The logarithmic roller profile reduces edge stresses at the roller, raceway contact under all load conditions. Also, the logarithmic outer ring outside diameter profile reduces edge loading during operation and contributes to extended service life.
  
• Enhanced operational reliability
  The surface finish on the contact surfaces of the rollers and raceways supports the formation of a hydrodynamic lubricant film.
  
• Effective lubrication
  The most SKF backing bearings have lubrication holes and many have one or more annular grooves in the inner ring to enable lubrication through the support shaft.

Sensor bearing units

SKF sensor bearing units are used to monitor accurately the status of rotating or linear components and are compact, robust and reliable, simple and ready-to-mount.

Sensor integrated solutions engineered by SKF have been well proven in a variety of industrial and automotive applications. For example: electric motors, electric vehicles, road rollers, tractors, forklifts and conveyors. Typical uses include:

• Motor management
• Steering
• Speed and position sensing
• Measurement of angular position

Hybrid bearings

Hybrid bearings have rings made of bearing steel and rolling elements made of bearing grade silicon nitride (Si3N4), which make the bearings electrically insulating.

Silicon nitride rolling elements can extend bearing service life by offering enhanced bearing performance, even under difficult operating conditions.

The standard assortment of SKF hybrid bearings comprises popular sizes for electric motors and generators. Involve:

• Single row deep groove ball bearings
  • Basic design
  • Sealed design
  • XL hybrid design
• Single row cylindrical roller bearings

Hybrid bearings provided in this section constitute the basic SKF assortment and are only part of the total assortment. Other hybrid bearings include:

• Hybrid super-precision bearings (Super-precision bearings)
  • Hybrid super-precision angular contact ball bearings
  • Hybrid super-precision cylindrical roller bearings
  • Hybrid super-precision angular contact thrust ball bearings, single and double direction
• Hybrid angular contact ball bearings
• Hybrid stainless steel deep groove ball bearings
• Bearing units incorporating hybrid bearings

INSOCOAT bearings

Electric motors, generators and associated equipment are endangered when an electric current passes through their bearings. This can damage the contact surfaces of rolling elements and raceways in the bearings , so called electrical erosion and rapidly degrade the grease. An additional risk in electric motors and generators comes from high frequency currents caused by the inherent stray capacitance. The risk of damage increases where the application uses a frequency converter.

INSOCOAT bearings are designed to prevent electric current from passing through the bearing. The external surfaces of either their inner or outer ring are coated with an insulating aluminium oxide layer, by applying a sophisticated plasma-spray process for an outstanding quality finish. The solutions are very cost effective compared with other insulation methods.

High temperature bearings and bearing units

SKF high temperature bearings and bearing units are designed to deliver increased reliability, reduced complexity and decreased environmental impact in operating temperatures up to 350 °C (660 °F), making these products very suitable for applications in kiln trucks, roller hearth furnaces, and bakeries. Because SKF high temperature bearings correspond to the ISO dimensions of grease-lubricated bearings, production efficiencies and cost savings can be realized with a simple change to the SKF bearing solution.

The SKF standard assortment of high temperature bearings and bearing units corresponding to ISO standards includes:

• Deep groove ball bearings
• Insert bearings 
• Ball bearing units

These bearings are customized for use in applications such as:

• Automatic wafer baking ovens in the food and beverage industry
• Industrial furnaces
• Chains

NoWear coated bearings

NoWear is a wear-resistant carbon coating that can be applied to the rolling elements and inner ring raceway(s) of a bearing (designation suffix L7DA) or only the rolling elements (designation suffix L5DA).

A physical vapour deposition process applies the wear-resistant carbon coating. Thickness of the coating ranges from 1 to 3 μm, depending on the size of the bearing. The hardness of the coating is 1 200 HV10.

NoWear coated bearing surfaces retain the toughness of the underlying material while adopting the hardness, improved friction properties and wear-resistance of the coating.

During the running-in period, minute amounts of the coating material are transferred to the counter-surfaces. This coating reduces friction and improves resistance against wear and smearing, even in bearings where only the rolling elements are coated.

Bearings with Solid Oil

SKF bearings with Solid Oil are designed for use in applications where high levels of moisture and incidental contact with water and other contaminants are real issues. Bearings with Solid Oil are lubricated for the life of the bearing and cannot be relubricated.

Solid Oil:

• is an oil saturated, polymer material moulded into the bearing, forming very narrow gaps between the rolling elements, raceways and cage(s), enabling the bearing to rotate freely
• having a porous structure, with millions of micro-pores that retain the lubricating oil by surface tension
• virtually fills all of the free space in the bearing
• releases oil into the narrow gaps, during operation, providing effective minimum quantity lubrication

Indexing roller units

SKF indexing roller units are based on double or four-row full complement cylindrical roller bearings.

They have been developed for continuous furnaces of sintering and pelletizing plants. These ready-to-mount units are also suitable for heavy load applications where the direction of rotation is frequently reversed, or where rotational speeds are low.

• High load carrying capacity
  
  The thick-walled outer ring enables high radial loads to be accommodated, while reducing distortion and bending stresses. Because of their inner ring flanges, indexing roller units can also accommodate heavy axial loads.
  The maximum number of rollers in double and four-row cylindrical roller bearings without a cage incorporated, contribute to the high load carrying capacity.
• Low friction
  
  The surface finish on the contact surfaces of the rollers and raceways as well as the optimized internal geometry of these roller units keeps friction at start-up and in operation at a very low level.
• Long service life
  
  The logarithmic roller profile reduces edge stresses at the roller/raceway contact.

Pillow block ball bearing units

SKF pillow (plummer) block ball bearing units consist of an insert bearing mounted in a housing, which can be bolted to a support surface. The SKF assortment includes units compliant with ISO standards, North American standards, or Japanese Industrial Standards (JIS). Within the SKF assortment, you can find units for nearly all requirements.

In addition, SKF FoodLine ball bearing units provide hygienic and high-performance bearing unit solutions for the most demanding food and beverage environments.

Examples of applications in which pillow block ball bearing units might be used:​

• Agricultural Applications
• Construction machinery
• Food and beverage processing and packaging
• Conveyor systems
• Material handling systems
• Packaging systems
• Textile equipment
• Air Handling
• Special machinery, e.g. car wash systems, gym equipment, go-karts

Flanged ball bearing units

SKF flanged ball bearing units consist of an insert bearing mounted in a housing, which can be bolted to a machine wall or frame. The SKF assortment includes units compliant with ISO standards, North American standards, or Japanese Industrial Standards (JIS). Within the SKF assortment, you can find units for nearly all requirements regarding bolt patterns or locking on the shaft.

SKF FoodLine ball bearing units provide hygienic and high-performance bearing unit solutions for the most demanding food and beverage environments:

• Elevator systems
• Food and beverage processing and packaging
• Conveyor systems
• Power transmission
• Construction machinery
• Agricultural machinery
• Packaging systems

Take-up ball bearing units

SKF take up ball bearing units consist of an insert bearing and a housing, and are compliant with ISO standards, North American standards, and Japanese Industrial Standards (JIS), as required by many industrial applications. In contrast, take-up units for the SKF FoodLine are not compliant with these standards and are therefore considered as not standardized.

The SKF take up ball bearing unit assortment comprises insert bearing series and designs, with the main differences between the take-up units being the housing design, the locking method onto the shaft, the sealing solution, and the options for end covers and back seals. Explore the variety of take-up units and possible combinations available in the product details below.

Take up units are typically mounted in take up frames and are connected by an adjustment screw.

• Material handling, including elevator systems and conveyor systems
• Food and beverage processing and packaging
• Power transmissions

Rubber seating rings

Rubber seating rings "cushion" insert bearings in pressed steel pillow block housings. This helps dampen vibration and noise, and enables these bearings to be displaced slightly in their housings so that minor shaft expansion or misalignment can be accommodated. They can be fitted on all SKF insert bearings, except for those with a standard inner ring (17262, 17263 series).

Rubber seating rings are made of NBR and can withstand temperatures ranging from -30 to +100 °C (-20 to +210 °F).

Rubber seating rings are available as an accessory and must be ordered separately.

Ball bearing units for agriculture applications

SKF ball bearing units for agriculture applications are available for each application and machine design, making it possible to build more value into the machine design, reduce warranty costs, reduce the number of suppliers - and stay ahead of the competition.

Improve performance and farm productivity

• Dedicated solutions for agricultural applications
• Long and reliable component service life
• High-performance sealing solutions - tested and well proven
• Built-in reliability helps extend warranty periods

Reduce management costs

• Reduce warranty cases and associated costs
• Fewer service engineers in the field and callbacks to distributors
• Wide, dedicated assortment reduces engineering and development time and costs
• Fewer suppliers for greater efficiency and cost-effectiveness

Reduce machine ownership costs

• Reduce replacement time and repair costs
• Units with fewer components for quick and easy mounting
• Less unplanned downtime

SKF Food Line ball bearing units

SKF FoodLine ball bearing units offer the potential for a relubrication free solution for most wet, abrasive and contaminating environments. They are available in a range of component designs and variants, to enable the configuration of the bearing unit best suited for various applications and environments. SKF FoodLine ball bearing units are available as standard in the following designs and variants:

• Composite housings for the SKF FoodLine
  • Pillow block ball bearing units
  • Flanged ball bearing units
  • Take-up ball bearing units
• Stainless steel housings
  • Pillow block ball bearing units
  • Flanged ball bearing units

Other variants are possible by ordering the parts separately.

Ball bearing units for air handling applications

Typical applications for ball bearing units, also called unit balls in some markets, in the air handling or HVACR (Heating, Ventilation, Air Conditioning and Refrigeration) industry include:

• Fans for supplying fresh air to commercial or residential buildings
• Fans for removing waste heat or contaminated air
• Fans in air handling units (AHU) for air conditioning
• Fin fan coolers for industrial heat exchangers

Applications in the air handling industry can vary substantially based on their specific requirements, such as:

• Ease of mounting and dismounting
• Reliability and long service life, with low or no maintenance
• Ability to accommodate misalignment and flexible support structures
• Low friction for high efficiency, cool and quiet running
• Protection against dust and humidity in the application environment
• Capability to withstand very low and high temperatures
• Cost efficiency

Ball bearing units with composite housings

SKF ball bearing units with a composite housing are part of SKF's extensive line of cost effective mounted products. These light weight, ready to mount units are particularly well suited for applications with relatively high speeds, moderate loads, and where reliability and minimal maintenance are key factors.

SKF composite housings are made of a glass fibre reinforced polyamide material (PA6). These lightweight housings resist a variety of chemicals and diluted acids.

The highlights of these housings are:

• excellent corrosion resistance
• tolerant of high and low temperatures
• lightweight
• dimensionally interchangeable with cast iron units
• excellent UV resistance
• paintable
• recyclable
• available with end covers

The sealed insert bearing is pre-lubricated for the life of the bearing with a lithium/calcium base grease. This long lasting, water-resistant grease combined with the highly effective integral seals and high performance design of appropriately selected SKF ball bearing units can provide long, reliable service life without the costs and environmental issues of relubrication.

Pillow block roller bearing units

SKF pillow block roller bearing units consist of a spherical or tapered roller bearing mounted in a non-split housing that can be bolted to a support surface. The units are sealed and lubricated so ready to use. This assortment of units covers a wide range of requirements. Metric series units comply with ISO 113 boundary dimensions. Inch series units are not standardized, but SKF roller bearing units are dimensionally interchangeable with most common designs in the marketplace.

• Material handling systems
• Mining, mineral processing and cement
• Conveyor systems
• Process equipment
• Agricultural applications
• Air handling
• Food and beverage, processing and packaging
• Automation
• Marine
  
• Metals industry

Flanged roller bearing units

SKF flanged roller bearing units consist of a spherical/ tapered roller bearing mounted in a cast iron housing that can be bolted to a machine wall. The units are sealed and lubricated so ready to use. This assortment of units covers a wide range of requirements. Both metric and inch series are not standardized, but SKF roller bearing units are dimensionally interchangeable with most common designs in the marketplace.

• Material handling systems
• Mining, mineral processing and cement
• Conveyor systems
• Process equipment
• Agricultural applications
• Air handling
• Food and beverage, processing, packaging and mixers
• Automation
• Marine
  
• Metals industry

Take-up roller bearing units

SKF take-up roller bearing units consist of a spherical or tapered roller bearing mounted in a non-split cast iron housing that can be mounted to the most common take-up frames in the marketplace. The units are sealed and lubricated so ready to use. The assortment covers a wide range of requirements. The units are not standardized, but SKF roller bearing units are dimensionally interchangeable with most common designs.

• Material handling systems
• Mining, mineral processing and cement
• Conveyor systems
• Agricultural applications
• Automation
• Construction machinery

Split plummer block housings - SNL 2, 3, 5 and 6 series

SNL plummer pillow block housings are the most popular SKF bearing housings on the market. Developed to be the first choice for design, quality and economy. They enable the incorporated bearings to achieve maximum service life with less need for maintenance. Different housing variants and seal designs are available, making the use of tailored housings virtually unnecessary and enabling cost-effective bearing arrangements to be made.

Spherical roller bearings
CARB toroidal roller bearings
Bearing dimension series 02, 03, 22, 23, 32
Shaft diameter range 20 to 160 mm3/4 to 51/2 in.
Stepped shaft with bearing on a cylindrical seat
Seals Four-lip V-ring
Labyrinth Heavy-duty
Felt
Lubrication Grease preferred, oil possible
Materials Grey cast iron
Spheroidal cast iron
Mounting Two-bolt mounting
Four-bolt mounting
Compliance to standards ISO 113 (two-bolt plummer block housings)
Supersedes SE, SN, SNA, SNH 

Split plummer block housings - SNLN 30 series

SNLN 30 plummer pillow block housings are robust and versatile housings. They are designed for bearings in the 30 dimension series. And can also accommodate some bearings in the 40 dimension series for mounting on a cylindrical shaft seat. They enable the incorporated bearings to achieve max service life with reduced maintenance requirements. Different housing variants and seal designs are available, making the use of tailored housings virtually unnecessary and enabling cost effective bearing arrangements to be made.

Split plummer block housings - SNL 30, 31 and 32 series

SNL Split plummer pillow block housings in the 30, 31 and 32 series are robust and suitable for tough operating conditions. They enable the incorporated bearings to achieve maximum service life with reduced maintenance requirements. Different housing variants and seal designs are available, making the use of tailored housings virtually unnecessary and enabling cost-effective bearing arrangements to be made.

Split plummer block housings - SONL series

SONL plummer pillow block housings are specially designed for oil lubrication. They can accommodate high temperatures and bearings operating at high speeds. They have a strong, stiff design and they are characterized by a number of built-in features that maximize the effects of the lubricant and extend bearing service life.

SONL housings can be found in applications ranging from fans and flywheels to paper machines and emergency power generators.

Split pillow blocks - SAF and SAW series (inch dimensions)

SAF and SAW split pillow plummer block housings are popular SKF bearing housings with inch dimensions, developed to be the first choice for design, economy and quality.

Split pillow blocks - SDAF series including the extended range

All SDAF housings which include the SDAF extended range, are heavy-duty split pillow plummer block housings designed for tough operating conditions where heavy loads and shock loads require a housing that is exceptionally sturdy.

All SDAF housings are made to order. Housings in the extended range are typically customized to meet the needs of a particular application.

Non-split pillow housings and take-up housings - SBD and THD series

SBD pillow plummer block housings and THD take-up housings are non-split housings, designed to accommodate heavy loads acting in different directions. These types of loads are typically encountered in conveyors, roller beds and crushers.

Highly reliable bearing arrangements can be designed using SBD or THD housings, together with SKF Explorer bearings. In conveyors, SBD and THD housings are often used together.

Flanged housings - FNL series

FNL flanged housings are wellproven machine parts that provide simple, reliable housing in applications without horizontal frames. They enable the full service life potential of the incorporated bearings to be exploited but with reduced maintenance requirements.

Two-bearing housings - PD series

SKF two-bearing housings were originally developed for fan shafts with an overhung impeller but they are also suitable for other applications with similar shaft arrangements. Compared to the conventional shaft arrangement where two self-aligning bearings are mounted in separate pillow plummer block housings, two-bearing housings provide several advantages including improved running accuracy and quieter operation.

PD two-bearing housings can also be supplied as ready-to-mount units.

Housings for paper machines - SBFN, SBPN and SDM series

With increasing demands placed on the output of paper machines, the operating conditions for housings, bearings and seals in this application are quite severe. Very high temperatures are typical and the risk of water contamination is always high. SKF provides housings for felt rolls, drying cylinders, and Yankee cylinders (used for producing tissue and board).

Trunnion bearing housings for grinding mills - FSDR...K series

FSDR ... K housings are large, low-weight pillow plummer block housings designed specifically for grinding mills. They operate under arduous conditions in highly contaminated environments. With their highly effective sealing solution. They enable the incorporated bearing to achieve maximum service life by preventing the ingress of contaminants and enabling easy access for inspection and maintenance when necessary.

Single-row deep groove, Type S

Handle big, high-speed radial loads and thrust loads

MRC single-row radial deep groove bearings can carry significant radial loads, because of the uninterrupted raceway grooves and the high degree of conformity between balls and raceways. It can carry substantial thrust loads in either direction, even at very high speeds.

A range of arrangements

MRC single-row radial deep groove bearings are available open, with single or double shields/seals, and snap rings in various combinations.

Single-row maximum capacity, filling notch, Type M

Designed for heavy or predominantly radial loads

MRC's single-row Maximum "M-type" bearings have a single filling slot in both, the inner and outer ring, enabling more balls to be added. Because of the increased ball compliment, filling slot bearings have a higher radial load carrying capacity than bearings without filling slots.

They can be used in applications with heavy radial loads or a combination of radial and thrust loads, where the radial load is predominant. They are not recommended for use where only thrust loads are present.

A range of arrangements

MRC single-row radial deep groove bearings are available open with single or double shields/seals, and snap rings in various combinations.

Self-aligning ball bearings

Designed to handle misalignment

MRC self-aligning bearings have two rows of balls with a common sphered raceway in the outer ring. This gives the bearings their self-aligning property, permiting angular misalignment of the shaft relative to the housing.

They are therefore particularly suitable for applications where misalignment can arise from errors in mounting or from shaft deflection. MRC non-sealed self-aligning ball bearings have the lowest friction of any bearing type.

Double-row angular contact, 5000 series

Robust performance with a 30° contact angle

MRC double-row angular contact ball bearings are manufactured in two main types: C-type as Conrad construction and M-type as maximum capacity with filling notches. Each of the two rows has a 30° contact angle.

Single-row 15º angular contact, Type R and XLS

Handle heavy radial loads

MRC R-type bearings are single-row 15° angular contact ball bearings with one heavy race shoulder and one counterbored race shoulder on the outer ring.

Because of this construction it is possible to incorporate a greater number of balls than in the deep-groove non-filling notch bearing. R-type bearings have ample radial capacity and moderate thrust capacity in order to accommodate those applications involving heavy radial loads..

Single-row angular contact 7000, 7000P, and 7000PJ series

29° contact angle for heavy thrust loads

MRC 7000 Series bearings are single row 29° angular contact ball bearings with one heavy race shoulder and one counterbored race shoulder on the outer ring. Because of this construction it is possible to incorporate a greater number of balls than in the deep groove non-filling notch bearing.

MRC 7000 Series angular contact ball bearings should be used in applications in which the thrust load is heavy and beyond the capacity of single-row types. Example for a heavy thrust load in one direction or a heavy thrust load in one direction combined with a radial load.

PumPac 8000, 8000BB, and 8000AAB series

40° and 15° bearing contact angles for varying thrust loads

The PumPac 8000 Series consists of a matched set of 40° (A) and 15° (B) angular contact ball bearings with computer optimized internal design. They are manufactured to ABEC-3 tolerances and are supplied with an inner ring centered machined brass cage.

Also available is the 8000BB PumPac Diamond Series consisting of two 15° (B) bearings in a back-to-back (DB) arrangement; and the 8000AAB Series consisting of two 40° (A) bearings in tandem, matched back-toback (DB) with one 15° (B) bearing.

Single-row angular contact, split ring, 9000 series

Maximum thrust capacity with 29° and 40° contact angles

The MRC 9000 Series bearings are compact, two-directional max thrust capacity bearings. Available in five separate ranges to meet different operating conditions.

Precision ABEC 5 and ABEC 7 bearings

Built for high speed and extreme running accuracy

Precision ball bearings in tolerance grades ABEC-5 and ABEC-7 are recommended for applications where high speed and,or extreme running accuracy is required.

These bearings have the same nominal external dimensions as equivalent size ABEC-1 grade bearings but running characteristics and external dimensions are held to closer tolerances.

Specialty bearings

Solutions for a range of unique applications

In addition to our standard line of bearing products, MRC can also supply several non-standard or specialty bearings. Just a few examples include:

• Adapter bearings
• Conveyor bearings
• Dynamometer bearings
• Electric motor quality bearings
• Felt seal replacement bearings
• Mast guide bearings
• Wide inner ring bearings

The most common cause of pump bearing failure is not fatigue.

Thrust bearings for centrifugal pumps rarely achieve the theoretical life specified by API and ANSI standards. This is because pump bearings usually fail from causes other than fatigue:

• Impact
• Static vibration
• Contamination
• Insufficient loading
• Excessive thrust
• Misalignment
• Inadequate/ineffective lubrication

MRC offers the widest selection of ball bearings for pumps in the bearing industry. A solution exists for nearly every combination of loads and speeds.

Hybrid ceramic ball bearings

MRC Hybrid ceramic ball bearings use a combination of traditional 52100 steel rings precision matched with silicon nceramic balls. In addition to being excellent electric insulators, hybrid bearings have a higher speed capability and will provide longer service life than all-steel bearings in most applications.

Marathon series

Corrosion-resistant solutions for food and beverage applications

Maintenance-free Marathon® mounted bearing units incorporate cast or machined stainless steel housings, stainless insert bearings to enhance durability, corrosion resistance in challenging food, beverage industry applications. Stainless steel housings can withstand exposure to extremely aggressive washdown chemicals, even when present in strong concentrations.

In addition to Marathon composite units, our HDi-heavy-duty cast iron-and XDs-extreme-duty cast stainless steel have been introduced to more thoroughly meet the needs of the industry.

The HDi series combines corrosion resistance together with the strength of cast iron-without the problem of flaking nickel plating-and are priced competitively with nickel-plated versions. For extremely challenging applications, the XDs series provides top of the line corrosion resistance, the greatest housing strength available within the Marathon line.

Angular contact ball bearings

SKF manufactures super-precision angular contact ball bearings for shaft diameters from 6 to 360 mm. Application requirements vary and as a result the SKF assortment of super-precision angular contact ball bearings includes four ISO dimension series in numerous executions. The wide selection of designs and variants enables them to be incorporated into virtually every machine tool application as well as other applications where precision bearings are required.

Cylindrical roller bearings

SKF super-precision cylindrical roller bearings are characterized by:

• High speed capability
• High rigidity
• High radial load carrying capacity
• Low friction
• Low cross-sectional height

These bearings are therefore particularly wellsuited for machine tool spindles where the bearing arrangement must accommodate heavy radial loads and high speeds, while providing a high degree of stiffness.

SKF super-precision single row cylindrical roller bearings have a higher speed capability than double row bearings while double row bearings are more suitable for heavier loads.

Double direction angular contact thrust ball bearings

SKF double direction angular contact thrust ball bearings are designed to locate spindle shafts axially in both directions. These bearings are intended for mounting in combination with cylindrical roller bearings in the NN30K or N10K series in the same housing bore. This bearing combination simplifies machining of the housing bore.

Double direction angular contact thrust ball bearings are manufactured with the same nominal bore size and outside diameter as corresponding cylindrical roller bearings. But the outside diameter tolerance of the housing washers, combined with the housing bore diameter and geometric tolerances recommended for super-precision cylindrical roller bearings under light to normal load and rotating inner ring load will result in an appropriate radial clearance in the housing bore. This clearance is sufficient to prevent radial loads from acting on the thrust bearing provided that its outer ring is not axially clamped in the housing.

Axial-radial cylindrical roller bearings

Super-precision axial-radial cylindrical roller bearings are commonly used to support rotary tables, indexing heads and multi-spindle heads on machining centres. SKF manufactures super-precision axial-radial cylindrical roller bearings for shaft diameters from 80 to 850 mm. Their internal design, together with close tolerance manufacturing processes enables these bearings to attain radial run-out better than and axial run-out close to, P4 tolerance class.

Angular contact thrust ball bearings for screw drives

Machine tools require screw drives that can position a work piece or machine component quickly and efficiently and precisely. To meet these requirements, screw drives can be supported at both ends by SKF super-precision angular contact thrust ball bearings. The bearings provide a high degree of axial stiffness and high axial load carrying capacity and accommodate high speeds and rapid accelerations and offer very high running accuracy.

Angular contact thrust ball bearings for screw drives are well suited for screw drive applications but are also beneficial in other applications where reliable radial, axial support is required together with extremely precise axial guidance of the shaft.

Precision lock nuts

Industrial lock nuts with lock washers aren't considered to be suitable for super-precision bearing applications because of the relatively wide manufacturing tolerances of the thread and abutment surfaces. As a result SKF has developed a full line of precision lock nuts that are manufactured within very tight tolerances. These simple to mount devices which locate bearings and other components accurately and efficiently on a shaft and meet the requirements of machine tool applications, Both technically and economically.

All SKF precision lock nuts use friction between the mating thread flanks of the spindle shaft and lock nut to hold them in place. To apply this friction SKF manufactures precision lock nuts in the following design:

• precision lock nuts with locking pins

Gauges

Conventional measuring methods and instruments are not always suitable for checking tapered seats or measuring the inside or outside envelope diameter of the roller set of a cylindrical roller bearing in precision applications. However SKF has developed an assortment of gauges specially designed to take the accurate measurements necessary when mounting cylindrical roller bearings with a tapered bore. These gauges are also useful for other than precision applications.

Ring gauges in the GRA30 series and DMB taper gauges can be used to check the most common tapered seats. A GRA ring gauge can only be used to check a tapered seat for a particular bearing size. DMB taper gauges but can be used for a range of diameters as well as for tapers other than 1:12.

To precisely adjust the radial internal clearance or preload when mounting a cylindrical roller bearing with a tapered bore. It is necessary to accurately measure the inside or outside envelope diameter of the roller set(s). SKF internal clearance gauges in the GB30 and GB10 series and in the GB49 series enable simple and accurate measuring.

Slewing bearings

Slewing bearings comprise an inner ring and an outer ring, one of which usually incorporates a gear. Together with attachment holes in both rings, they enable an optimized power transmission with a simple and quick connection between adjacent machine components. The bearing raceways, in conjunction with the rolling elements and cages or spacers are designed to accommodate loads acting singly or in combination and in any direction.

SKF manufactures standard and customized slewing bearings in various designs with outside diameters from 0,1 to 18 m to meet the demands of particular applications:

• Slewing bearing with four-point contact ball bearing
  
• Slewing bearing with eight-point contact ball bearing
  
• Slewing bearing with crossed cylindrical roller bearing
• Slewing bearing with triple row roller bearing 
• Slewing bearing with wire race bearing 
• Customized slewing bearing  
  

Radial spherical plain bearings

Radial spherical plain bearings have an inner ring with a sphered convex outside diameter and an outer ring with a correspondingly sphered but concave inside surface. Their design makes them particularly suitable for bearing arrangements where alignment movements between shaft and housing have to be accommodated or where oscillating or recurrent tilting or slewing movements must be possible at relatively slow sliding speeds and often accompanied with heavy loads.

SKF supplies a wide assortment of radial spherical plain bearings with various sliding contact surface combinations.

Designs, series and variants:

• Radial spherical plain bearings requiring maintenance
  • heavy-duty steel/steel
  • standard steel/steel
• Maintenance-free radial spherical plain bearings
  • steel/PTFE FRP
  • steel/PTFE fabric
  • SKF Explorer steel/steel
  • steel/PTFE sintered bronze

Angular contact spherical plain bearings

Angular contact spherical plain bearings are spherical in shape and inclined at an angle to the bearing axis. This design makes them well suited for accommodating combined loads. Single angular contact spherical plain bearings can only accommodate axial loads acting in one direction and can be separated, enabling the rings to be mounted separately.

SKF manufactures maintenancefree single acting angular contact spherical plain bearings with a steel/PTFE FRP sliding contact surface combination in the GAC series as standard. Other design and series are available on request.

Thrust spherical plain bearings

Thrust spherical plain bearings have a convex spherical surface on the shaft washer and a corresponding concave spherical surface in the housing washer. These bearings are intended to accommodate axial loads primarily but can also accommodate combined loads. The radial load component of a combined load should not exceed 50% of the axial load component. When radial loads are larger thrust bearings should be combined with radial bearings in the GE dimension series.

Thrust spherical plain bearings can be separated, enabling shaft and housing washers to be mounted separately.

SKF manufactures maintenancefree thrust spherical plain bearings with a steel/PTFE FRP sliding contact surface combination in the GX series as standard.

Rod ends

Rod ends consist of an eye-shaped head with integral shank that forms a housing for a spherical plain bearing. They are used primarily on the ends of hydraulic or pneumatic pistons to join the cylinder to an associated component.

Designs, series and variants:

Rod ends requiring maintenance

• steel/steel
  • female thread with a slotted shank
  • female or male thread
  • welding shank, cylindrical or rectangular section
• steel/bronze
  • female or male thread

Maintenance-free rod ends, female or male thread

• steel/PTFE FRP
• steel/PTFE fabric
• steel/PTFE sintered bronze

Bushings

SKF manufactures bushings in various designs and from different materials. However SKF offers a wide assortment of bushings available from stock.

Bushings are suitable for rotating, oscillating and linear movements, whereas straight cylindrical bushings can accommodate radial loads only and flanged bushings can accommodate radial and axial loads in one direction.

Each combination of bushing design and material has characteristic properties and makes a bushing particularly suitable for certain applications.

Thrust washers

SKF composite dry sliding thrust washers are designed for applications where axial space is limited. Maintenance is not possible and where lubricant starvation can occur.

As well as for composite bushings and strips, SKF manufactures composite thrust washers as standard from PTFE and POM composite materials.

Strips

SKF composite dry sliding strips are designed for applications where axial space is limited. Maintenance is not possible and where lubricant starvation can occur. Strips can be bent, pressed or coined to form flat linear guides. For example: L- or V-shaped profiles or other types of dry sliding components and fit the actual application.

As well as for composite bushings and thrust washers, SKF manufactures composite strips as standard from PTFE and POM composite materials.

Reali-Slim thin section bearings

Reali-Slim thin section bearings are a lightweight and compact solution for applications where space is limited. They are available in three different bearing types:

• angular contact ball bearings (type A)
• radial contact ball bearings (type C)
• four-point contact ball bearings (type X)

The Kaydon standard assortment of Reali-Slim thin section bearings includes open and sealed bearings as well as many other variants. The bearings can be customized to meet specific application needs.​

• Thin cross section:
  In applications where space is limited, Reali-Slim thin section bearings offer a very compact design.
• Light weight:
  Reali-Slim thin section bearings can enable significant weight savings, which may result in cost savings for the overall application.

Ultra-Slim thin section bearings

Ultra-Slim thin section bearings have the thinnest cross sections in the entire SKF bearing portfolio. And they are a very compact solution for applications where space is limited. They are available in three different bearing types:

• angular contact ball bearings (type A)
• radial contact ball bearings (type C)
• four-point contact ball bearings (type X)

Kaydon standard Ultra-Slim thin section bearings are made of stainless steel and include spacer balls as separators. The bearings can be customized to meet specific application needs.​

• Light weight:
  Ultra-Slim thin section bearings can enable significant weight savings, which may result in cost savings for the overall application.
• Corrosion resistance:
  Ultra-Slim thin section bearings are made of stainless steel and are therefore corrosion resistant when exposed to moisture and several other harsh environments.

Reali-Slim TT turntable thin section bearings

Reali-Slim TT turntable thin section bearings have inner and outer ring raceway designs that enable them to accommodate radial, axial and moment loads simultaneously. They are based on a sealed four-point contact ball bearing and are available in three different designs:

• bearings without a gear 
• bearings with an internal (inner ring) gear
• bearings with an external (outer ring) gear

Kaydon standard Reali-Slim TT turntable thin section bearings are made of stainless steel. The bearings can be customized to meet specific application needs.​

• Thin cross section:
  Small-scale Reali-Slim TT turntable thin section bearings offer a very compact design and beneficial design versatility.
• Light weight:
  Reali-Slim TT turntable thin section bearings can enable significant weight savings which may result in cost savings for the overall application.
• Corrosion resistance:
  The bearings are made of stainless steel and are therefore corrosion resistant when exposed to moisture and other harsh environments.

BB series metric thin section ball bearings

BB series metric thin section ball bearings are based on a four-point contact ball bearing. They are designed to match the bores and widths of common cross-roller bearings. With additional features not commonly available in standard cross-roller bearings. BB series bearings provide beneficial design flexibility. The bearings can be further customized to meet specific application needs.​

• Thin cross section:
  In applications where space is limited. BB series metric thin section bearings offer a very compact design.
• Light weight:
  BB series bearings can enable significant weight savings which may result in cost savings for the overall application.
• Dimensionally interchangeable with cross-roller bearings:
  With additional flexibility in design, BB series bearings should be considered as a practical alternative to the use of cross-roller bearings.

Power transmission seals

CR Seals are radial and axial shaft sealing solutions for power transmission applications supports virtually every industrial sector. From large-size wind turbines to very small and high-speed machine tools. For off-highway applications, we offer undercarriage sealing solutions for wheeled equipment which include SKF Mudblock cassette seals and the innovative SKF Trackstar seals for tracked machinery.

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Lubricants

Poor lubrication accounts for over 36% of premature bearing failures.

SKF lubricants are designed for your needs and tested for performance in real applications. Our experience with bearings and lubricants and applications helps us to offer the right lubricants for your applications and improve your overall lubrication scheme.
Testing and validating each production batch is our way to offer excellent lubricant quality around the globe.
Specialized lubricant tests and continuous research in the field of lubrication allows SKF to further optimize our knowledge and support you with right lubrication for your machines.

SKF lubricants offer major advantages:

• Global availability with consistent quality
• Designed and tested to perform under real conditions

Manual lubrication tools

The right lubrication is essential for machine performance and reliable operation.

The right lubricant has to be supplied in the right quantity at the right time in the right quality to the right location. Particularly contamination during the transfer process, applying too much or less lubricant and using the wrong lubricant for a lubrication point are common problems and it can easily be prevented. The SKF manual lubrication tools are specifically designed and selected to support these processes with a wide product portfolio for lubricant storage and handling and dosing and labelling and analyzing and applying lubricants.

Benefits of manual lubrication tools

• Select the best products for your needs from a wide product portfolio for storage, handling, dosing, labelling, analyzing and applying lubricants
• Avoid mistakes during manual lubrication with tools that are designed to support the "right" lubrication

Lubricators

Automatic lubricators are installed on single lubrication points and automatically dispense the proper amount of lubricant to the application. Especially, when lubrication points are difficult to access for safety reasons or their location in the plant, automatic lubricators can offer the solution. A wide range of single point automatic lubricators and accessories offers a solution for most lubrication points. Utilizing automatic lubricators helps to improve worker safety and maintenance efficiency and machine reliability.

Benefits of automatic lubricators

• Support maintenance efficiency with automated lubricant supply
• Increase worker safety for lubrication of difficult to access lubrication points

Automatic lubrication systems

The right lubricant in the right quantity at the right time to the right lubrication point.

Centralized automatic lubrication systems are an effective way to increase machine availability while reducing reliance on scarce talent. These systems provide the appropriate lubrication quantity at the correct intervals and minimizing friction and wear and optimizing bearing and machinery service life.

Designed to lubricate individual machines or complete plants and automatic lubrication systems provide proper and precise lubricant replenishment to all required points and enabling a range of benefits in the process.

Benefits:

• Significant savings in repair and spare costs
• Up to 50% savings in lubricant costs due toIncreased machine reliability
•  accurate timing and dosing of lubricants
• Fewer shutdowns and production losses
• Greater workers' safety
• Reduced environmental impact

Hydraulic tools for mounting and dismounting

Mounting

Medium and large SKF bearings with a tapered bore are often mounted using hydraulic equipment. SKF tools and techniques enable a controlled and precise way for SKF bearings to be mounted correctly and this helps achieve a long bearing service life. The techniques employed can also be used for other annular components such as gear and railway wheels.

Dismounting

SKF hydraulic tools and techniques allow bearings and similar components on cylindrical and tapered shafts to be dismounted in a safe and controlled manner. SKF offers a comprehensive range of tools and accessories to dismount bearings and components that enhance worker safety and also reduce the risk of component damage.

With the SKF hydraulic mounting and dismounting techniques you can achieve:

• More control, allowing precision, repeatability and  accuracy to be maintained
• Less manual effort
• Lower risk of damaging bearings, components and shafts
• Greater operator safety

Mechanical tools for mounting and dismounting

Mounting

Small and medium size bearings are generally cold mounted. Traditional methods can cause forces to be transmitted through the rolling elements, resulting in damage to the raceways. SKF's mechanical mounting tools help prevent bearing damage during cold mounting.

Dismounting

Choosing the right puller for the dismounting job is critical. The puller type, and its maximum withdrawal capacity are crucial for completing any dismounting job safely and easily. SKF offers a complete range of easy-to-use mechanical, hydraulic and hydraulically-assisted bearing pullers for use in many bearing applications.

• Axial lock nut sockets

• Bearing fitting tool kit

• Combi kits
  

• Hookspanners
  

• Lock nut spanner
  

• Impact spanners

Heaters for mounting and dismounting

Mounting

Incorrect methods account for 16% of premature bearing failures. SKF Induction heaters utilise advanced power electronics with application specific designs for high performance. Thats why, by using an SKF induction heater the total cost of ownership is often significantly lower. Ergonomics and safety are also an important consideration for operators.

SKF induction heaters are equipped with design features that make them easy to use and safe. Bearing support arms reduce the risk of the bearing toppling during heating and ergonomically designed yokes help reduce operator fatigue. So the remote control enables the operator to control the heater at a safe distance from the hot workpiece and enhancing operator safety.

Dismounting

SKF's range of heating equipment enables quick, safe dismounting of cylindrical roller bearing inner rings and covers a wide range of applications. Aluminium heating rings TMBR series are designed for dismounting inner rings of small and medium-size cylindrical roller bearings. Adjustable and fixed induction heaters EAZ series are suitable for frequent dismounting of various sizes of cylindrical roller bearing inner rings:

• Electric hot plate

• Portable induction heate
  

• Small / Medium / Large / Extra Large induction heater
  

• Multi-core induction heater
  

Alignment tools

Misalignment of shafts and belt drives and chain drives is a major contributor to rotating machinery breakdowns.

Accurate alignment can prevent a large number of machinery breakdowns, reduce the number of unplanned stops, loss of production. Accurate alignment can also help to extend the life time of your machines.

In today's challenging environment of reducing costs and optimizing assets the necessity of accurate alignment is now greater than ever.

SKF offers the following alignment tools:

• Belt alignment tools
• Adjustable chocks
• Shaft alignment tools
• Machinery shims