55939

View detailed technical data, stock status, and sourcing information for: 55939
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-00-012-0399

Item Name Code

01858

Assigment Date

01/01/1963 (63 years ago)

A nut, flat on top and bottom, having 4 flat sides. 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.)

0.545 inches minimum and 0.5625 inches maximum width across flats, 0.208 inches minimum and 0.225 inches maximum nut height, right-hand thread direction, 2b thread class, square nut style

Product Characteristics

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

Thread Class: 2b
Thread Direction: right-hand
Nut Style: square
Nut Height: 0.208 inches minimum and 0.225 inches maximum
Width Across Flats: 0.545 inches minimum and 0.5625 inches maximum
Thread Series: unc
Thread Quantity Per Inch: 18
Nominal Thread Size: 0.312 inches
Bearing Surface Type: flat
Material: steel overall
Surface Treatment: cadmium or zinc overall

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5310-00-268-7267	No Name Available	01/01/1963

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
120399	Square Plain Nut
153684	Square Plain Nut
24D05	Square Plain Nut
55939	Square Plain Nut

FAQs

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

What is the FSCG of the NSN 5310-00-012-0399?

The FSCG of the NSN 5310-00-012-0399 is 5310

Does the NSN 5310-00-012-0399 have a Schedule B code assigned?

Yes, the Schedule B code is 7318160000

Does NSN 5310-00-012-0399 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 5310-00-012-0399 contain precious materials?

Precious metal content is unknown

Does NSN 5310-00-012-0399 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 5310-00-012-0399 was assigned to the Federal Catalog?

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