SKF Bushings, Thrust Washers and Strips a Wide Assortment for Virtually Every Application Contents

SKF bushings, thrust washers and strips A wide assortment for virtually every application Contents

The SKF brand now stands for more 1 Product information than ever before, and means more to you as a valued customer. A wide assortment to meet your needs...... 3

While SKF maintains its leadership SKF solid bronze bushings...... 4 as the hallmark of quality bearings throughout the world, new dimensions SKF sintered bronze bushings...... 6 in technical advances, product support and services have evol ved SKF into SKF wrapped bronze bushings...... 8 a truly solutions-oriented supplier, creating greater value for customers. SKF PTFE composite bushings, thrust washers and strips. . . 10

These solutions encompass ways to SKF POM composite bushings, thrust washers and strips. . . 12 bring greater productivity to customers, not only with breakthrough application- SKF PTFE polyamide bushings...... 14 specific products, but also through leading-edge design simulation tools SKF filament wound bushings...... 16 and consultancy services, plant asset efficiency maintenance program mes, and the industry’s most advanced 2 Product data supply management techniques. SKF bushings – product selection guide ...... 18 The SKF brand still stands for the very best in rolling bearings, but it now SKF bushings – technical data...... 20 stands for much more. Bushing selection – overwiew of technical data...... 21 SKF – the knowledge engineering company Product tables...... 24

2 A wide assortment to 1 meet your needs

SKF – number one in bearings SKF solid bronze bushings The traditional and robust bushing material SKF has gained a reputation for excellence in the roller bearing industry by providing customers with the highest quality products, solutions and services . Commitment to total quality is reflected in every product that SKF offers and bushings are no exception . SKF sintered bronze bushings Oil impregnation enables very high sliding velocity SKF – your bushing partner With a global sales network and logistics ex- pertise far superior to that of any competitor, SKF is able to provide customers with deliv- ery services and product solutions that are SKF wrapped bronze bushings second to none . Featuring the world’s widest Excellent in dirty environments due to lubrication pockets bushing stock assortment, SKF gives dis- tributors and customers the ability to meet all of their industrial application needs with one single source .

SKF PTFE composite plain bearings Select the right bushing for Long, maintenance-free service life due the application to low friction

Throughout the world we are recognized as the leading rolling bearing manufacturer . We are renowned for our excellent technical support and application know-how . How- SKF POM composite plain bearings ever, we are also a major player in the plain Optimized for minimal maintenance in difficult environments bearing field: spherical plain bearings, rod ends, and a much expanded range of bushings . The product selection guide in this cat- alogue simplifies the selection of bushings from our expanded range . SKF PTFE polyamide bushings The cost-effective, maintenance-free bushing

SKF filament wound bushings The maintenance-free bushing for extreme operating conditions

3 SKF solid bronze bushings

The traditional and robust Material bushing material SKF solid bronze bushings are made of a multi-component bronze, CuSn7Zn4Pb7-B, Solid bronze bushings, which are suitable which has very good sliding properties . All for use in a wide variety of applications, are surfaces of a solid bronze bushing are the most commonly used type of cylindrical machined . bushing . The solid bronze material is well suited for highly demanding applications in 1) tough environments . SKF offers a standard Main applications assortment of both straight and flanged SKF solid bronze bushings are intended for bushings . oscillating movements in both the radial and axial directions . SKF solid bronze bushings Advantages of SKF solid bronze are also suitable for applications where bushings include: rotating speeds are low . • insensitive to dirty environments • resistant to shock loads and vibrations at Applications include: low speeds • construction machinery • the possibility to operate with lower • transport equipment quality shaft finish • pulp and papermaking machinery • good resistance to corrosive • offshore equipment contaminants • equipped with grooves to retain lubricant

Positioning of the lubrication groove at different operating conditions

oil

rotating movement oscillating movement 15° F F 60° F

grease

b 1) 2b The performance of SKF solid bronze bushings depends on the interaction of load, lubrication, surface roughness, sliding velocity, and temperature encountered in specific applications .

4 1

Lubrication Characteristics SKF solid bronze bushings can be lubricated Permissible load (dyn/stat), N/mm2 25 / 45 with either oil or grease . The lubricant not Permissible sliding velocity, m/s 0,5 only improves the sliding properties, but Friction coefficient m (greased) 0,08 . . 0,15 also reduces wear and prevents corrosion . Temperature range, °C –40 . . +250 While oil is used in exceptional cases, solid bronze bushings are typically grease Application recommendations lubricated . Shaft tolerance e7 – e8 To protect the bushing and lubricant, Housing tolerance H7 seals are recommended in highly contamin Shaft roughness Ra, mm 0 . . 1,0 ated environments . Shaft hardness, HB 165 – 400 All bushings with a bore diameter > 14 mm incorporate an axial lubrication groove .

SKF solid bronze bushings are available both as straight and flanged bushings.

5 SKF sintered bronze bushings

Oil impregnation enables very Material high sliding velocity SKF sintered bronze bushings consist of a sintered metallic bronze and graphite matrix SKF sintered bronze cylindrical bushings (1% weight of graphite) with fully impreg are self-lubricating and maintenance-free . nated porosity . The material composition of These bushings consist of a porous bronze SKF sintered bronze bushings is SINT A51 matrix impregnated with lubricant . The per- with a porosity volume of 28%, impregnated missible sliding velocity for sintered bronze with mineral oil . Machining or grinding of bushings is very high, making them suitable the sliding surface of a porous sintered for rotating applications . SKF offers a full bushing is not recommended due to the risk line of both straight and flanged of closing the bushing pores . sintered bronze bushings .

1) Advantages of SKF sintered bronze Main applications bushings include: SKF sintered bronze bushings are most suit- • very high sliding velocity able for applications with rotating move- • lubrication free ments and where self-lubricating properties • maintenance-free operation of the material are a prerequisite . • good frictional properties Applications include: • electrical equipment • household equipment • printing machinery • machine tools

L h13 B h13 L h13

d E7 D r7 d E7 D1 js13 D r7

1) The performance of SKF sintered bronze bushings depends on the interaction of load, lubrication, surface roughness, sliding velocity, and temperature encountered in specific applications .

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Lubrication Characteristics When storing or mounting, the bushing Permissible load (dyn/stat), N/mm2 10 / 20 should never come in contact with absorb- Permissible sliding velocity, m/s 0,25 . . 5 ent material as it may wick the oil away very Friction coefficient m (greased) 0,05 . . 0,10 quickly . Therefore, SKF recommends keep- Temperature range, °C –10 . . +90 ing the bushing in it’s original package until just prior to mounting . Application recommendations Additional lubrication is usually not Shaft tolerance f7 – f8 necessary . Housing tolerance H7 Shaft roughness Ra, mm 0,2 . . 0,8 Shaft hardness, HB 200 – 300

SKF sintered bronze bushings, which are impregnated with a lubricant, are available both as straight and flanged bushings.

7 SKF wrapped bronze bushings

Lubrication pockets help Material extend bushing service life SKF wrapped bronze bushings are made entirely of bronze, CuSn8 . The bushings are SKF wrapped bronze bushings are particu- produced from strips which are then larly well suited for applications where high wrapped and calibrated . levels of contamination make relubrication necessary . The sliding surface of an SKF 1) wrapped bronze bushing contains diamond Main applications shaped pockets that must initially be filled These bushings are well suited for machin- with grease . The pockets act as reservoirs ery that must operate in highly contaminated to progressively release lubricant during environments and where shock loads and/or operation . SKF offers a full range of both vibrations occur . straight and flanged wrapped bronze bushings . Straight bushings are manufactured to Applications include: dimensions in accordance with ISO 3547-1 . • agricultural machinery • hoisting equipment Advantages of SKF wrapped bronze • construction machinery bushings include: • forestry machinery • insensitive to contaminated environments • resistant to shock loads and vibrations at slow speeds • good resistance to corrosive environments

Diamond-shaped lubricant reservoirs

1) The performance of SKF wrapped bronze bushings depends on the interaction of load, lubrication, surface roughness, sliding velocity, and temperature encountered in specific applications .

8 1

Lubrication Characteristics Whether grease or oil is used, a good quality Permissible load (dyn/stat), N/mm2 40 / 120 lubricant will reduce friction and wear by Permissible sliding velocity, m/s 1,0 separating a bronze bushing from its shaft . Friction coefficient m (greased) 0,08 . . 0,15 To protect the bushing and lubricant in highly Temperature range, °C –40 . . +150 contaminated environments, SKF recommends using seals . Application recommendations Shaft tolerance e7 – f8 Housing tolerance H7 Shaft roughness Ra, mm 0,4 . . 0,8 Shaft hardness, HB 150 – 400

SKF wrapped bronze bushings are available both as straight and flanged bushings.

9 SKF PTFE composite bushings, thrust washers and strips

Extend service life with PTFE Material composite plain bearings SKF PTFE composite plain bearings combine the mechanical strength of steel with the SKF PTFE composite plain bearings are the low friction of a PTFE-based self-lubricating maintenance-free solution to premature lead-free sliding layer . The intermediate bearing failure in heavy load/medium speed layer of porous tin bronze creates a strong applications . The SKF assortment of PTFE bond between the backing and sliding sur- composite plain bearings consist of a wide faces and also improves the dissipation of range of both straight and flanged bushings, heat generated during operation . To protect thrust washers and strips . the bearings from corrosion, the steel back- Straight bushings are manufactured to ing is tin-plated . With the exception of the dimensions in accordance with ISO 3547-1 . sliding surface, PTFE composite dry sliding bearings can be machined . Calibration is Advantages of SKF PTFE composite possible within certain limits . plain bearings include: • maintenance-free operation 1) • very good frictional properties Main applications • high load carrying capacity SKF PTFE composite dry sliding bearings • operating temperatures up to 250 °C are suitable for applications where there are • sliding velocity up to 2 m/s heavy loads and where a sliding material • small operating clearance with self lubricating properties is a prerequisite .

Applications include: • automotive • material handling equipment • home appliances and consumer goods • textile machinery

Cross section of SKF PTFE composite plain bearings

PTFE tin bronze

sheet steel backing

tin layer1) 1) The performance of SKF PTFE composite plain bearings depends on the interaction of load, lubrication, 1) Strips come without tin layer as standard surface roughness, sliding velocity, and temperature encountered in specific applications .

10 1

Lubrication Characteristics The PTFE-based sliding surface permits Permissible load (dyn/stat), N/mm2 80 (v ≤ 0,02) / 250 smooth, low-friction operation without lu- Permissible sliding velocity, m/s 2,0 (p ≤ 1,0)1) brication . During a short running-in phase, Friction coefficient m 0,03 . . 0,25 there will be some transfer of PTFE material Temperature range, °C –200 . . +250 from the sliding contact surface to the coun- terface . After this transfer, the characteristic Application recommendations low friction and wear properties of these Shaft tolerance f7 – h8 bearings will be achieved . Housing tolerance H7 The presence, or continuous supply of oil Shaft roughness Ra, mm 0 . . 0,4 or other non-corrosive fluids may be advan- Shaft hardness, HB 300 – 600 tageous and improve the performance of these bearings . 1) See page 20

SKF PTFE composite plain bearings are available, both as straight and flanged bushings, washers and strips.

11 SKF POM composite bushings, thrust washers and strips

Optimal combination of Material minimal maintenance under SKF POM composite plain bearings are tough operating conditions suitable for applications that require min imal maintenance under difficult operating SKF POM composite plain bearings are conditions . As a result of the lubricant reten- referred to as prelubricated because they tion pockets on the sliding surface, SKF require only a trace of lubricant to operate POM composite plain bearings are especially satisfactorily for long periods . The bearing well-suited for applications in contaminated material is designed to operate with mar- environments where lubricant cannot be ginal lubrication and effectively fills the gap supplied continuously or frequently . between fully lubricated bearings and dry sliding bearings . The SKF assortment of 1) POM composite plain bearings consist of Main applications a wide range of straight bushings, thrust SKF POM composite plain bearings are suit- washers and strips . able for applications where there are heavy Straight bushings are manufactured to loads and where the self-lubricating prop- dimensions in accordance with ISO 3547-1 . erties of the material are a prerequisite .

Advantages of SKF POM composite Applications include: plain bearings include: • agricultural equipment • maintenance-free operation • construction machinery • very good frictional properties • material handling equipment • high load carrying capacity • home appliances and consumer goods • high sliding velocity • small operating clearance

Cross section of SKF POM composite plain bearings

POM tin bronze

sheet steel backing

tin layer1) 1) The performance of SKF POM composite plain bearings depends on the interaction of load, lubrication, 1) Strips come without tin layer as standard surface roughness, sliding velocity, and temperature encountered in specific applications .

12 1

Lubrication Characteristics SKF POM composite plain bearings are Permissible load (dyn/stat), N/mm2 120 (v ≤ 0,02) / 250 designed to operate under marginal lubrica- Permissible sliding velocity, m/s 2,5 (p ≤ 1,0)1) tion conditions . The sliding surface of these Friction coefficient m 0,02 . . 0,20 plain bearings contains grease reservoirs Temperature range, °C –40 . . +110 which should be filled prior to installation . It is not necessary to relubricate these plain Application recommendations bearings, but the presence of a lubricant can Shaft tolerance f7 – h8 extend the plain bearing service life consid- Housing tolerance H7 erably . To protect the mating surface against Shaft roughness Ra, mm 0 . . 0,8 corrosion, grease can be applied periodically . Shaft hardness, HB 150 – 600

1) See page 20

SKF POM composite plain bearings are available as straight bushings, washers and strips.

13 SKF PTFE polyamide bushings

The cost-effective Material maintenance-free bushing SKF PTFE polyamide bushings are made from a glass-fibre reinforced thermoplastic The thermoplastic material used to make that contains PTFE . The material mix SKF PTFE polyamide bushings provides enables these self-lubricating, wear-resist- maintenance-free, dry sliding operation . SKF ant bushings to accommodate moderate PTFE polyamide bushings are designed for loads . applications where other polymer bushings might fail prematurely . These thin-walled 1) bushings promote heat dissipation, enabling Main applications high sliding velocities . SKF offers a standard SKF PTFE polyamide bushings are suitable assortment of both straight and flanged for applications where cost-effective main- PTFE polyamide bushings . Straight bush- tenance-free bushings are preferred . ings are manufactured to dimensions in accordance with ISO 3547-1 . Applications include: • textile machinery Advantages of SKF PTFE polyamide • medical equipment bushings include: • fitness equipment • maintenance-free • household equipment • cost-effective • corrosion-resistant • electrical insulator

1) The performance of SKF PTFE polyamide bushings depends on the interaction of load, lubrication, surface roughness, sliding velocity, and temperature encountered in specific applications .

14 1

Lubrication Characteristics SKF PTFE polyamide bushings are designed Permissible load (dyn/stat), N/mm2 40 / 80 for dry operation . A lubricant can, however, Permissible sliding velocity, m/s 1,0 improve the performance of these bushings . Friction coefficient m 0,06 . . 0,15 With an adequate supply of grease, oil, Temperature range, °C –30 . . +110 water or other liquid, the operating speed of these bushings can be increased . SKF PTFE Application recommendations polyamide bushings are resistant to most Shaft tolerance h8 – h9 lubricating oils and greases . Housing tolerance H7 Shaft roughness Ra, mm 0 . . 0,8 Shaft hardness, HB 100 – 300

SKF PTFE polyamide bushings are available both as straight and flanged bushings.

15 SKF filament wound bushings

The maintenance-free Material bushing for extreme The modern technique of fibre winding, operating conditions together with a specially developed resin matrix, combines the outstanding mechan SKF filament wound bushings are made ical properties of glass-fibre with the excel- from resin and fibres wound in multiple lay- lent tribological behaviour of PTFE and high ers . This composite material was specially strength thermoplastic PES fibres . With the developed to accommodate heavy loads, exception of the sliding layer, all SKF fila- vibrations and corrosive environments . ment wound bushings can be machined . SKF filament wound bushings are often dimensionally interchangeable with solid 1) bronze or steel bushings . SKF offers a Main applications standard assortment of filament wound SKF filament wound bushings are suitable bushings with dimensions in accordance for applications where there are heavy loads with ISO 4379 . and vibrations and where maintenance-free operation is preferred . Advantages of SKF filament wound bushings include: Applications include: • high load carrying capacity • construction machinery • accommodate shock loads and vibrations • agricultural and forestry machinery • low sensitivity to misalignment • hoisting and conveyor equipment and edge loading • offshore equipment • maintenance-free operation • corrosion-resistant • very good frictional behaviour • very good electrical insulator

Cross section of SKF filament wound bushing

1) The performance of SKF filament wound bushings depends on the interaction of load, lubrication, surface roughness, sliding velocity, and temperature encountered in specific applications .

16 1

Lubrication Characteristics SKF filament wound bushings have excellent Permissible load (dyn/stat), N/mm2 140 / 200 dry sliding characteristics due to the unique Permissible sliding velocity, m/s 0,5 sliding surface consisting of PTFE and PES Friction coefficient m 0,03 . . 0,08 fibres in an epoxy resin . The low friction Temperature range, °C –50 . . +140 sliding surface does not require additional lubricant . However, the presence of a lubri- Application recommendations cant offers protection against contaminants Shaft tolerance h8 and has no negative effect . Housing tolerance H7 NOTE: Seals are recommended when the Shaft roughness Ra, mm 0,2 – 0,4 bushing is to be used in a highly contamin Shaft hardness, HB > 490 ated environment .

SKF filament wound bushings are available as straight bushings.

17 SKF bushings, thrust washers and strips – product selection guide

Solid bronze Sintered bronze Wrapped bronze PTFE composite POM composite PTFE polyamide Filament wound

Self-lubricating performance not suitable good not suitable excellent good excellent excellent

Maintenance-free operation not suitable good suitable excellent good excellent excellent

Dirty environments good suitable excellent not suitable suitable not suitable good

Corrosion-resistant good suitable good suitable suitable excellent excellent

High temperature good not suitable good excellent suitable suitable good

Heavy load suitable not suitable suitable good excellent suitable good

Shock loads/vibrations good suitable good suitable suitable not suitable excellent

High sliding velocity not suitable excellent suitable good good suitable not suitable

Low friction not suitable good not suitable excellent excellent suitable excellent

Poor shaft surface finish good not suitable suitable not suitable suitable suitable suitable

Small operating clearance not suitable suitable suitable excellent good suitable not suitable

Insensitive to misalignment good suitable suitable not suitable suitable suitable good

Assortment

Product series designation PBM PBMF PSM PSMF PRM PRMF PCM . . E PCMW . . E PCM . . M PCMW . . M PPM PPMF PWM PCMF . . E PCMS . . E PCMS . . M

18 SKF bushings, thrust washers and strips – product selection guide