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31 - Bearings

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PSC Description 
3110 Bearings, antifriction, unmounted 
3120 Bearings, plain, unmounted 
3130 Bearings, mounted 



GROUP 31 Bearings Note- All bearings, including specially de- signed, lubricated, and/or selected, are to be classified in the appropriate classes of this group. Bearings are parts that supports an- other part which rotates, slides, or oscillates in or on it.

3110 Bearings, Antifriction, Unmounted Note This class includes bearings that generally have roller or balls confined by an inner and outer ring to relieve friction in/on/around rotating/moving mecha- nisms. Includes Ball Bearings; Roller Bearings; Balls; Races. Excludes Plain Bearings (FSC 3120); Jewel Bearings (FSC 3120)

3120 Bearings, Plain, Unmounted Note Bearings in this class are gener- ally one piece that retain and position moving and/or rotating parts. They may have lubrication grooves/fittings/facilities or include pre-lubrication. Includes Sleeve Bearings; Split Bearings; Washer Type Bearings; Jewel Bearings. Excludes Antifriction Bearings (FSC

3110); Mounted Bearings (FSC 3130).

3130 Bearings, Mounted Note This class includes bearings that generally have roller or balls confined by an inner and outer ring to relieve friction in/on/around rotating/moving mecha- nisms. Includes Pillow Block Units; Cartridge Units; Flange Units;Takeup Units; Hanger Box Units; Flat Box Units; Step Box Units. Excludes Antifriction Bearings (FSC

3110); Plain Unmounted Bearings (FSC

3120).