4B21S4-017

View detailed technical data, stock status, and sourcing information for: 4B21S4-017
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Federal Supply Group

Bearings

Federal Supply Classification

3120 Unmounted Plain Bearings

National Stock Number

3120-00-288-4998

Item Name Code

13205

Assigment Date

01/01/1963 (63 years ago)

square all corners corner shape, 0.5262 inches minimum and 0.5312 inches maximum overall length, 125.0 microinches left end surface of body surface finish, 0.2495 inches minimum and 0.2505 inches maximum body inside diameter, 0.3730 inches minimum and 0.3735 inches maximum body outside 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: 0.5262 inches minimum and 0.5312 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
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
4B21S4-017	Sleeve Bearing

FAQs

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

What is the FSCG of the NSN 3120-00-288-4998?

The FSCG of the NSN 3120-00-288-4998 is 3120

Does the NSN 3120-00-288-4998 have a Schedule B code assigned?

Yes, the Schedule B code is 8482997090

Does NSN 3120-00-288-4998 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 3120-00-288-4998 contain precious materials?

Item does not contain precious metal.

Does NSN 3120-00-288-4998 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 3120-00-288-4998 was assigned to the Federal Catalog?

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