MS51991-108

View detailed technical data, stock status, and sourcing information for: MS51991-108
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5325 Fastening Devices

National Stock Number

5325-00-158-4052

Item Name Code

11444

Assigment Date

04/28/1971 (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, 0.4050 inches minimum and 0.4350 inches maximum thread length, right-hand thread direction, 9/16 in.-12 insert size, 3b thread class

Product Characteristics

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

Thread Class: 3b
Thread Direction: right-hand
Thread Length: 0.4050 inches minimum and 0.4350 inches maximum
Length: 0.620 inches nominal
Insert Size: 9/16 in.-12
Thread Quantity Per Inch: 16
Nominal Thread Size: 0.3750 inches
Material: steel comp 1117 overall
Material Document And Classification: aisi assn std single material response overall
Surface Treatment: passivate overall
Style Designator: serrated
Thread Series Designator: unjc

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
MS51991-108	Screw Thread Insert
RJ108SB10	Screw Thread Insert

FAQs

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

What is the FSCG of the NSN 5325-00-158-4052?

The FSCG of the NSN 5325-00-158-4052 is 5325

Does the NSN 5325-00-158-4052 have a Schedule B code assigned?

Yes, the Schedule B code is 9606100000

Does NSN 5325-00-158-4052 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 5325-00-158-4052 contain precious materials?

Item does not contain precious metal.

Does NSN 5325-00-158-4052 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 5325-00-158-4052 was assigned to the Federal Catalog?

It was assigned 55 years ago, on Wed, Apr 28, 1971