5305-01-371-2389

Find complete technical information, availability, and procurement data for: 5305-01-371-2389
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-371-2389

Item Name Code

18257

Assigment Date

02/09/1993 (33 years ago)

A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use shim. For items fabricated from ceramic or electrically rated materials by specification or industry standards use insulator (1), washer. Excludes:disk, valve, graphite impregnated and lubricated items.

right-hand thread direction, 2a thread class, 1.313 inches minimum and 1.375 inches maximum fastener length, hexagon head style, 1.000 inches minimum and 1.187 inches maximum 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: 1.000 inches minimum and 1.187 inches maximum
Fastener Length: 1.313 inches minimum and 1.375 inches maximum
Head Style: hexagon
Head Height: 0.226 inches minimum and 0.243 inches maximum
Width Between Flats: 0.5510 inches minimum and 0.5625 inches maximum
Nominal Thread Diameter: 0.375 inches
Thread Quantity Per Inch: 16
Hardness Rating: 40.0 rockwell c minimum and 48.0 rockwell c maximum overall
Material: steel comp 431 overall
Material Document And Classification: astm f593 cond ht assn std single material response overall
Surface Treatment: passivate overall
Surface Treatment Document And Classification: qq-p-35 fed spec single treatment response overall
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
12387152-63	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-371-2389?

The FSCG of the NSN 5305-01-371-2389 is 5305

Does the NSN 5305-01-371-2389 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-371-2389 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 5305-01-371-2389 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-371-2389 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 5305-01-371-2389 was assigned to the Federal Catalog?

It was assigned 33 years ago, on Tue, Feb 9, 1993