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).
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