SK251-21

View detailed technical data, stock status, and sourcing information for: SK251-21
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5325 Fastening Devices

National Stock Number

5325-00-741-1354

Item Name Code

07623

Assigment Date

01/01/1961 (65 years ago)

1.875 inches nominal inside diameter, not casehardened casehardening indicator, rectangular cross-sectional shape style, 2.250 inches nominal outside diameter, 0.093 inches minimum and 0.097 inches maximum major thickness

Product Characteristics

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

Cross-Sectional Shape Style: rectangular
Inside Diameter: 1.875 inches nominal
Casehardening Indicator: not casehardened
Outside Diameter: 2.250 inches nominal
Major Thickness: 0.093 inches minimum and 0.097 inches maximum
End Style: 90 degree parallel
Ring Style: straight gap
Usage Design: external
Material Hardness Rating: 43.0 rockwell c minimum and 48.0 rockwell c maximum
Special Features: 0.005 in. max corner radius on id and od one side only
Material: steel comp 1065
Material Document And Classification: astm a576, comp 1065 assn std single material response

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5340-00-382-7438	No Name Available	10/01/1975
2520-00-462-3513	No Name Available	01/01/1963

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
2019975	Retaining Ring
399346	Retaining Ring
3BLA01012	Retaining Ring
42357R	Retaining Ring
639537	Retaining Ring
7411354	Retaining Ring
8A7292	Retaining Ring
8A8224	Retaining Ring
SK251-21	Retaining Ring
T93-29	Retaining Ring

FAQs

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

What is the FSCG of the NSN 5325-00-741-1354?

The FSCG of the NSN 5325-00-741-1354 is 5325

Does the NSN 5325-00-741-1354 have a Schedule B code assigned?

Yes, the Schedule B code is 9606100000

Does NSN 5325-00-741-1354 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 5325-00-741-1354 contain precious materials?

Precious metal content is unknown

Does NSN 5325-00-741-1354 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 5325-00-741-1354 was assigned to the Federal Catalog?

It was assigned 65 years ago, on Sun, Jan 1, 1961