4B21S4-020

View detailed technical data, stock status, and sourcing information for: 4B21S4-020
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Federal Supply Group

Bearings

Federal Supply Classification

3120 Unmounted Plain Bearings

National Stock Number

3120-00-288-5236

Item Name Code

13205

Assigment Date

01/01/1960 (66 years ago)

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.

0.2495 inches minimum and 0.2505 inches maximum body inside diameter, square all corners corner shape, 0.6200 inches minimum and 0.6250 inches maximum overall length, 0.3730 inches minimum and 0.3735 inches maximum body outside diameter, steel overall material

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Overall Length: 0.6200 inches minimum and 0.6250 inches maximum
Body Outside Diameter: 0.3730 inches minimum and 0.3735 inches maximum
Body Inside Diameter: 0.2495 inches minimum and 0.2505 inches maximum
Corner Shape: square all corners
Material: steel overall
Style Designator: split, plain, no outside flanges

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
4B21S4-020	Sleeve Bearing
LD137-0017-2020	Sleeve Bearing

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 3120-00-288-5236?

The FSCG of the NSN 3120-00-288-5236 is 3120

Does the NSN 3120-00-288-5236 have a Schedule B code assigned?

Yes, the Schedule B code is 8482997090

Does NSN 3120-00-288-5236 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 3120-00-288-5236 contain precious materials?

Precious metal content is unknown

Does NSN 3120-00-288-5236 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.

When the NSN 3120-00-288-5236 was assigned to the Federal Catalog?

It was assigned 66 years ago, on Fri, Jan 1, 1960