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 bush- ings . 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 encoun- tered 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 encoun- tered in specific applications . 6 1 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 bush- ings . 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 encoun- tered 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