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FEDERAL SUPPLY CLASSIFICATION

FSG 31 Bearings

Note- All bearings, including specially designed, lubricated, and/or selected, are to be classified in the appropriate classes of FSG 31 Bearings. Bearings are parts that supports another part which rotates, slides, or oscillates in or on it.

FSG 31 Bearings
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 mechanisms. 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 generally 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 mechanisms.
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).