5310-01-221-7020

Find complete technical information, availability, and procurement data for: 5310-01-221-7020
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-01-221-7020

Item Name Code

29736

Assigment Date

12/03/1985 (40 years ago)

A nut on which has been assembled a nonremovable washer. An integral feature is incorporated for locking on the threads of a mating member.

0.460 inches maximum washer outside diameter, free-running all metal design locking feature, 3b thread class, 0.283 inches minimum and 0.288 inches maximum nut counterbore diameter, right-hand thread direction

Product Characteristics

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

Thread Class: 3b
Thread Direction: right-hand
Locking Feature: free-running all metal design
Washer Outside Diameter: 0.460 inches maximum
Counterbore Diameter: 0.283 inches minimum and 0.288 inches maximum nut
Overall Height: 0.280 inches nominal
Nut Style: flat with turned up edge
Nut Counterbore Depth: 0.087 inches minimum and 0.097 inches maximum nut
Width Across Flats: 0.306 inches minimum and 0.313 inches maximum
Temp Rating: 450.0 fahrenheit maximum
Thread Series: unjf
Thread Quantity Per Inch: 28
Hardness Rating: 39.0 rockwell c minimum and 43.0 rockwell c maximum
Nominal Thread Size: 0.250 inches
Special Features: washer rockwell c scale 40.0 min and 45.0 maxz use with k-fast automatic tool
Material: steel washer
Material: steel comp e4340 or steel comp 4140 or steel comp 8740 nut
Material Document And Classification: mil-s-5000 mil spec 1st material response or mil-s-5626 mil spec 2nd material response or mil-s-6049 mil spec 3rd material response nut
Surface Treatment: cadmium and chromate overall
Surface Treatment Document And Classification: qq-p-416,ty 2,cl 2 fed spec single treatment response 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
KFN542-4S	Assembled Washe Self-Locking Nut

FAQs

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

What is the FSCG of the NSN 5310-01-221-7020?

The FSCG of the NSN 5310-01-221-7020 is 5310

Does the NSN 5310-01-221-7020 have a Schedule B code assigned?

Yes, the Schedule B code is 7318160000

Does NSN 5310-01-221-7020 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 5310-01-221-7020 contain precious materials?

Item does not contain precious metal.

Does NSN 5310-01-221-7020 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 5310-01-221-7020 was assigned to the Federal Catalog?

It was assigned 40 years ago, on Tue, Dec 3, 1985