12640958-005

View detailed technical data, stock status, and sourcing information for: 12640958-005
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-657-2507

Item Name Code

18257

Assigment Date

08/04/2016 (10 years ago)

A tubular shaped unthreaded item with or without a flange at one end designed to be inserted into a hole to reduce the inside diameter of the hole and to protect the surrounding body structure from damage resulting from stress, strain, and/or vibration. The overall length must exceed 25 percent of the outside diameter or the shortest distance between peripheral flats of the body. Includes items which are divided into two or more segments which includes 180 degrees (3.141 radians) or less of the bearing periphery. For items made of rubber, see bushing, nonmetallic. See also bearing, sleeve; bushing, tapered; spacer, sleeve; insulator, bushing; and bushing, electrical conductor. Excludes:bushing, drill, jig.

1.00 inches nominal fastener length, hexagon head style, 2a thread class, right-hand thread direction, 1.00 inches nominal thread length

Product Characteristics

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

Thread Class: 2a
Thread Direction: right-hand
Thread Length: 1.00 inches nominal
Fastener Length: 1.00 inches nominal
Head Style: hexagon
Head Height: 0.195 inches minimum and 0.211 inches maximum
Width Between Flats: 0.489 inches minimum and 0.500 inches maximum
End Item Identification: mrap - m-atv ui w/ogpk
Nominal Thread Diameter: 0.3125 inches
Thread Quantity Per Inch: 18
Part Name Assigned By Controlling Agency: screw, cap, hex .31 - 18 tab g8 mb
Special Features: surface treatment is magni black 575
Color: black overall
Material: steel overall
Material Document And Classification: sae j429 assn std single material response overall
Surface Treatment: magni black 575
Thread Series Designator: unc

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
12640958-005	Hexagon Head Cap Screw
4000280008	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-657-2507?

The FSCG of the NSN 5305-01-657-2507 is 5305

Does the NSN 5305-01-657-2507 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-657-2507 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 5305-01-657-2507 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-657-2507 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 5305-01-657-2507 was assigned to the Federal Catalog?

It was assigned 10 years ago, on Thu, Aug 4, 2016