PMB21 Sleeve Bearing

Comprehensive specifications and application details for: PMB21 Sleeve Bearing.

Summary

Explore detailed summary information for bearing: PMB21. Includes NSN, classification group, and identification codes to support sourcing, compliance, and accurate part tracking.

Part Number: PMB21
Federal Supply Classification: 3120 Unmounted Plain Bearings
(NSN) National Stock Number: 3120-00-973-8651
Item Name Code: 13205
Federal Item Identification Guide: A045A0
Assigment Date: 10/10/1966

A tubular shaped item with or without flange(s) designed to reduce friction and carry a kinetic load on the surface(s) parallel to the axis of the bore. It must have a visible or detectable means of lubrication or be self-lubricated. The over all length must exceed 25 percent of the outside diameter or the shortest distance between peripheral flats of the body, except for straight tubular (without flange or shoulder) items having a bearing surface(s) parallel to the axis of the bore only. Includes items which are divided into two or more segments which include 180 degrees (3.141 radians) or less of the bearing periphery. See also bushing, sleeve; spacer, sleeve; and washer (as modified). Excludes:pin, hollow.

square all corners corner shape, 3.0040 inches minimum and 3.0050 inches maximum body inside diameter, 3.1910 inches minimum and 3.1930 inches maximum body outside diameter, grooved single x lubricant accommodation style, 0.9900 inches minimum and 1.0100 inches maximum overall length

Datasheet

Below are the comprehensive technical specifications for bearing: 3120-00-973-8651 . Find dimensions, materials, tolerances, performance characteristics, etc.

Body Inside Diameter: 3.0040 inches minimum and 3.0050 inches maximum
Body Outside Diameter: 3.1910 inches minimum and 3.1930 inches maximum
Corner Shape: square all corners
Lubricant Accommodation Style: grooved single x
Overall Length: 0.9900 inches minimum and 1.0100 inches maximum
Material: copper alloy inner layer
Material: steel outer layer
Style Designator: solid, plain, no outside flanges
Surface Treatment: tin outside diameter surface of body

Replaces

The NSN 3120-00-973-8651 is used in place of the following discontinued or alternate items:

NSN	Name	Date
3120-00-239-0942	No Name Available	02/01/1998

Frequently Asked Questions

Find quick answers to common questions about bearing: PMB21. Explore technical specifications, installation tips, maintenance guidelines, regulatory requirements, and troubleshooting advice.

What is the FSCG of the NSN 3120-00-973-8651?: The FSCG of the NSN 3120-00-973-8651 is 3120

Does the NSN 3120-00-973-8651 have a Schedule B code assigned?: Yes, the Schedule B code is 8482997090

Does NSN 3120-00-973-8651 require demilitarization?: Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 3120-00-973-8651 contain precious materials?: Precious metal content is unknown

Does NSN 3120-00-973-8651 contain hazardous materials?: Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.