NAS720B8-8

View detailed technical data, stock status, and sourcing information for: NAS720B8-8
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-137-7758

Item Name Code

06660

Assigment Date

09/02/1982 (43 years ago)

A screw, (as modified) to which has been assembled one or more nonremovable washer(s).

right-hand thread direction, 2a thread class, 0.500 inches nominal thread length, pan no. 2 head style, 0.500 inches nominal fastener length

Product Characteristics

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

Thread Class: 2a
Thread Direction: right-hand
Thread Length: 0.500 inches nominal
Fastener Length: 0.500 inches nominal
Head Style: pan no. 2
Head Diameter: 0.314 inches nominal
Head Height: 0.090 inches nominal
Washer Quantity: 2
Internal Drive Style: slot
Nominal Thread Diameter: 0.164 inches
Thread Quantity Per Inch: 32
Secondary Washer Relationship To Primary Washer: not identical
Secondary Washer Style: flat
Primary Washer Outside Diameter: 0.293 inches nominal
Secondary Washer Outside Diameter: 0.293 inches nominal
Primary Washer Style: split helical ring
Primary Washer Material Thickness: 0.040 inches nominal
Secondary Washer Material Thickness: 0.016 inches nominal
Material: copper alloy 342 fastener
Material: copper alloy 510 primary washer
Material: copper secondary washer
Surface Treatment: tin fastener
Surface Treatment: tin secondary washer
Surface Treatment: tin primary washer
Thread Series Designator: unc
Specification/Standard Data: 80205-nas720 professional/industrial association standard

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
NAS720B8-8	Assembled Washer Screw

FAQs

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

What is the FSCG of the NSN 5305-01-137-7758?

The FSCG of the NSN 5305-01-137-7758 is 5305

Does the NSN 5305-01-137-7758 have a Schedule B code assigned?

Yes, the Schedule B code is 7415338550

Does NSN 5305-01-137-7758 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 5305-01-137-7758 contain precious materials?

Precious metal content is unknown

Does NSN 5305-01-137-7758 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 5305-01-137-7758 was assigned to the Federal Catalog?

It was assigned 43 years ago, on Thu, Sep 2, 1982