8-21B19291-3B4B

View detailed technical data, stock status, and sourcing information for: 8-21B19291-3B4B
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Federal Supply Group

Bearings

Federal Supply Classification

3120 Unmounted Plain Bearings

National Stock Number

3120-00-650-2579

Item Name Code

13204

Assigment Date

12/03/1965 (60 years ago)

A detachable part in or on which a journal, gudgeon, pivot, or the like moves. It is used to carry a load and to reduce sliding friction. It does not employ rolling elements. It may be divided into two or more segments of 180 degrees (3.141 radians) or less. The item has a cylindrical bore and is basically spherical in its exterior design to allow for shaft misalignment. Excludes:bearing, plain, self-aligning.

30.4970 inches minimum and 30.5000 inches maximum spherical body diameter, 18.5610 inches minimum and 18.5620 inches maximum body inside diameter, 20.2500 inches nominal extension outside diameter, square all corners corner shape, 28.0000 inches nominal overall length

Product Characteristics

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

Overall Length: 28.0000 inches nominal
Body Inside Diameter: 18.5610 inches minimum and 18.5620 inches maximum
Extension Outside Diameter: 20.2500 inches nominal
Spherical Body Diameter: 30.4970 inches minimum and 30.5000 inches maximum
Corner Shape: square all corners
Material: steel outer layer
Material: tin alloy uns l13890 inner layer
Style Designator: segmented

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
8-21B19291-3B4B	Spherical Plain Bearing
8-21B19291-3BX4B	Spherical Plain Bearing

FAQs

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

What is the FSCG of the NSN 3120-00-650-2579?

The FSCG of the NSN 3120-00-650-2579 is 3120

Does the NSN 3120-00-650-2579 have a Schedule B code assigned?

Yes, the Schedule B code is 8482300040

Does NSN 3120-00-650-2579 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 3120-00-650-2579 contain precious materials?

Item does not contain precious metal.

Does NSN 3120-00-650-2579 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 3120-00-650-2579 was assigned to the Federal Catalog?

It was assigned 60 years ago, on Fri, Dec 3, 1965