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Machine Design

Precision thrust ball bearings - SKF USA Inc.

The BS series of super-precision, angular-contact, thrust ball bearings have static load ratings up to 245 kN, fatigue load limits up to 9.15 kN, and top speeds up to 17,000 rpm to provide axial guidance of shafts for machine-tool applications.
 The single-direction bearings have a 62° contact angle and polyamide 66 bearing cages. They are filled with calcium-complex-soap grease based on ester/mineral oil which is retained with steel-reinforced, oil and wear-resistant acrylonitrile-butadiene rubber (NBR) seals that are good from –40 to +100°C. They come in matched sets of two, three, or four bearings or as single, universally matchable bearings.
Double-direction bearings have a 60° contact angles, a one-piece outer ring, a two-piece inner ring, and NBR, sheet-steel-reinforced seals on both sides. The seals retain factory-filled, low-viscosity lithium-soap grease with ester oil as its base and operate from –40 to +120°C, although the grease’s upper operating temperature is 110°C.
Both bearing types have a ground transition between raceway and shoulder, a robust cage, heat treatment that provides constant preload, and tight manufacturing tolerances. Bearings can also be incorporated into cartridge units with flanged housing.
SKF USA Inc., 890 Forty Foot Rd., Kulpsville, PA 19443, (800) 440-4SKF,

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