640-FB-1/4

View detailed technical data, stock status, and sourcing information for: 640-FB-1/4
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-00-437-4361

Item Name Code

01855

Assigment Date

09/10/1969 (56 years ago)

2b thread class, cap nut style, right-hand thread direction, 0.500 inches nominal nut height, 0.560 inches nominal width across flats

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: cap
Nut Height: 0.500 inches nominal
Width Across Flats: 0.560 inches nominal
Thread Series: unf
Thread Quantity Per Inch: 20
Nominal Thread Size: 0.438 inches
Bearing Surface Type: chamfered
Material: copper alloy 360 or copper alloy 377 overall
Material Document And Classification: sae j463 assn std all material responses overall

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
13171127-1	Cap Plain Nut
51-04-08	Cap Plain Nut
534394-2	Cap Plain Nut
640-FB-1/4	Cap Plain Nut

FAQs

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

What is the FSCG of the NSN 5310-00-437-4361?

The FSCG of the NSN 5310-00-437-4361 is 5310

Does the NSN 5310-00-437-4361 have a Schedule B code assigned?

Yes, the Schedule B code is 7415290000

Does NSN 5310-00-437-4361 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 5310-00-437-4361 contain precious materials?

Precious metal content is unknown

Does NSN 5310-00-437-4361 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 5310-00-437-4361 was assigned to the Federal Catalog?

It was assigned 56 years ago, on Wed, Sep 10, 1969