5305-00-021-4581

Find complete technical information, availability, and procurement data for: 5305-00-021-4581
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-021-4581

Item Name Code

18257

Assigment Date

01/01/1963 (63 years ago)

Cancelled

This item was cancelled on: 07/01/2025.

An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. The threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. The thread length being the controlled dimension, the grip length is not specified. A locking feature may be incorporated in the design of the head or threads. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. Excludes:bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.

2a thread class, 0.625 inches nominal fastener length, right-hand thread direction, hexagon head style, 0.625 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: 0.625 inches nominal
Fastener Length: 0.625 inches nominal
Head Style: hexagon
Head Height: 0.188 inches nominal
Width Between Flats: 0.438 inches nominal
Nominal Thread Diameter: 0.250 inches
Thread Quantity Per Inch: 20
Material: steel overall
Thread Series Designator: unc

FAQs

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

What is the FSCG of the NSN 5305-00-021-4581?

The FSCG of the NSN 5305-00-021-4581 is 5305

Does the NSN 5305-00-021-4581 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-00-021-4581 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 5305-00-021-4581 contain precious materials?

Precious metal content is unknown

Does NSN 5305-00-021-4581 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 5305-00-021-4581 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963