Federal Supply Code 3130, Bearings, Mounted, encompasses bearings that generally have a roller or balls confined by an inner and outer ring to relieve friction in, on, and around the rotating or moving mechanisms. FSC 3130 includes pillow block units; cartridge units; flange units; take-up units; hanger box units; flat box units; and step box units. Note that FSC 3130 does not include antifriction bearings or plain unmounted bearings. For antifriction bearings, see FSC 3110. For plain unmounted bearings, see FSC 3120.
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