MS51991-208L

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5325 Fastening Devices

National Stock Number

5325-00-451-8991

Item Name Code

11444

Assigment Date

06/04/1971 (55 years ago)

A cylindrical item which may have wrenching and/or driving facilities and/or shoulders. It is designed to be inserted in a drilled, tapped or a pretapped hole, or molded or pressed into soft material to reduce the size of a tapped hole; to provide threads; to add strength, and/or to prevent stripping. It is one of the following: (1) a one-piece, flanged or unflanged, internally threaded item which may have external threads, and/or serrations around the periphery of the collar, designed to engage a serrated lock ring which is not included with the item; (2) a one-piece precision coiled wire; (3) a two-piece item consisting of an internally threaded cylinder and a mating externally threaded part; or (4) a one-piece internally threaded item whose outside diameter is tapered and/or knurled and/or with fin(s). The internal thread of the item may have a locking feature. Excludes:items having a sleeve on on its under portion which can be clinched or crimped. Excludes:bushing,machine thread; nut,plain,knurled; nut,plain,round; nut,plain,clinch and nut,self-locking,clinch. See also nut,plain,plate

0.620 inches nominal length, 9/16-12 unc 3a insert size, individually keyed features provided, serrated style designator, cadmium and chromate overall surface treatment

Product Characteristics

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

Length: 0.620 inches nominal
Insert Size: 9/16-12 unc 3a
Features Provided: individually keyed
Surface Treatment: cadmium and chromate overall
Style Designator: serrated

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
MS51991-208L	Screw Thread Insert
RJ208SB10L	Screw Thread Insert

FAQs

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

What is the FSCG of the NSN 5325-00-451-8991?

The FSCG of the NSN 5325-00-451-8991 is 5325

Does the NSN 5325-00-451-8991 have a Schedule B code assigned?

Yes, the Schedule B code is 9606100000

Does NSN 5325-00-451-8991 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 5325-00-451-8991 contain precious materials?

Precious metal content is unknown

Does NSN 5325-00-451-8991 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 5325-00-451-8991 was assigned to the Federal Catalog?

It was assigned 55 years ago, on Fri, Jun 4, 1971