657-7

View detailed technical data, stock status, and sourcing information for: 657-7
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-01-201-0306

Item Name Code

14218

Assigment Date

02/11/1985 (41 years ago)

0.022 inches nominal material thickness, external surfaces silver precious material and location, 0.377 inches minimum and 0.391 inches maximum hole diameter, 0.493 inches minimum and 0.507 inches maximum outside diameter, copper alloy overall material

Product Characteristics

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

Hole Diameter: 0.377 inches minimum and 0.391 inches maximum
Outside Diameter: 0.493 inches minimum and 0.507 inches maximum
Material Thickness: 0.022 inches nominal
Material: copper alloy overall
Precious Material And Location: external surfaces silver
Precious Material: silver
Surface Treatment: silver and chromate overall
Surface Treatment Document And Classification: qq-s-365,type 1,2,or 3,grade a fed spec all treatment responses overall
Style Designator: flat internal teeth

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
373-0191-010	Lock Washer
657-7	Lock Washer

FAQs

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

What is the FSCG of the NSN 5310-01-201-0306?

The FSCG of the NSN 5310-01-201-0306 is 5310

Does the NSN 5310-01-201-0306 have a Schedule B code assigned?

Yes, the Schedule B code is 7415210000

Does NSN 5310-01-201-0306 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 5310-01-201-0306 contain precious materials?

Item contains silver.

Does NSN 5310-01-201-0306 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 5310-01-201-0306 was assigned to the Federal Catalog?

It was assigned 41 years ago, on Mon, Feb 11, 1985