999A037

View detailed technical data, stock status, and sourcing information for: 999A037
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-019-2421

Item Name Code

16282

Assigment Date

04/14/1976 (50 years ago)

A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)

right-hand thread direction, 0.375 inches nominal fastener length, flat chamfer head style, 0.325 inches minimum thread length, 3a 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: 3a
Thread Direction: right-hand
Thread Length: 0.325 inches minimum
Fastener Length: 0.375 inches nominal
Head Style: flat chamfer
Head Diameter: 0.176 inches minimum and 0.183 inches maximum
Head Height: 0.108 inches minimum and 0.112 inches maximum
Locking Feature: pellet threads
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.112 inches
Width Across Flats: 0.094 inches nominal
Thread Quantity Per Inch: 40
Material: steel overall
Surface Treatment: cadmium 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
999A037	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-019-2421?

The FSCG of the NSN 5305-01-019-2421 is 5305

Does the NSN 5305-01-019-2421 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-019-2421 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 5305-01-019-2421 contain precious materials?

Precious metal content is unknown

Does NSN 5305-01-019-2421 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 5305-01-019-2421 was assigned to the Federal Catalog?

It was assigned 50 years ago, on Wed, Apr 14, 1976