4B21S8-030

View detailed technical data, stock status, and sourcing information for: 4B21S8-030
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Federal Supply Group

Bearings

Federal Supply Classification

3120 Unmounted Plain Bearings

National Stock Number

3120-00-288-4606

Item Name Code

13205

Assigment Date

01/01/1963 (63 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.

125.0 microinches left end surface of body surface finish, 0.6225 inches minimum and 0.6230 inches maximum body outside diameter, 0.9325 inches minimum and 0.9375 inches maximum overall length, square all corners corner shape, 0.4995 inches minimum and 0.5005 inches maximum body inside diameter

Product Characteristics

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

Overall Length: 0.9325 inches minimum and 0.9375 inches maximum
Body Outside Diameter: 0.6225 inches minimum and 0.6230 inches maximum
Body Inside Diameter: 0.4995 inches minimum and 0.5005 inches maximum
Corner Shape: square all corners
Surface Finish: 125.0 microinches left end surface of body
Surface Finish: 125.0 microinches right end surface of body
Surface Finish: 16.0 microinches outside diameter surface of body
Surface Finish: 250.0 microinches inside diameter surface of body
Material: steel overall
Surface Treatment: chromium outside diameter surface of body
Style Designator: solid, 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
4B21S8-030	Sleeve Bearing
LD137-0017-6030	Sleeve Bearing

FAQs

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

What is the FSCG of the NSN 3120-00-288-4606?

The FSCG of the NSN 3120-00-288-4606 is 3120

Does the NSN 3120-00-288-4606 have a Schedule B code assigned?

Yes, the Schedule B code is 8482997090

Does NSN 3120-00-288-4606 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 3120-00-288-4606 contain precious materials?

Precious metal content is unknown

Does NSN 3120-00-288-4606 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 3120-00-288-4606 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963