National Item Identification Number
National Stock Number
Federal Supply Class
An item fabricated from a single, internally cored casting, or composed of two or more separate castings, and designed to position and protect bearings, shafts, gears, and/or other components required for a mechanical drive. Includes items having access hole(s) to facilitate machining and assembling of components. It may include the access hole cover plate(s).
Commercial and Government Entity Code (Supplier Data)
Reference Numbers (Part Numbers)
3.553 INCHES NOMINAL