1657B

View detailed technical data, stock status, and sourcing information for: 1657B
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5340 Commercial Hardware

National Stock Number

5340-01-052-6782

Item Name Code

40280

Assigment Date

12/17/1977 (48 years ago)

A shaped metallic item designed to increase the effectiveness of radio frequency/electromagnetic interference, or a nonmetallic item containing a wire mesh, metal, or other electrically conductive particles designed to provide environmental sealing and radio frequency/electromagnetic interference shielding. For bulk items see wire mesh, knitted or gasketing material, conductive.

0.250 inches nominal left internal (includes thru thread) thread length, 1.000 inches nominal length, 0.188 inches nominal diameter, kc-46 support equipment end item identification, 0.250 inches nominal right internal thread length

Product Characteristics

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

Thread Length: 0.250 inches nominal left internal (includes thru thread)
Thread Length: 0.250 inches nominal right internal
Diameter: 0.188 inches nominal
Length: 1.000 inches nominal
End Item Identification: kc-46 support equipment
Cross-Sectional Shape: round
Material: copper alloy 360 overall
Material Document And Classification: qq-b-626 fed spec single material response overall
Surface Treatment: cadmium or chromate overall
Surface Treatment Document And Classification: qq-p-416, type 2, class 2 fed spec all treatment responses overall
Style Designator: left internal and right internal threads

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5340-01-200-6593	No Name Available	06/01/1986

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
1657B	Spacing Threaded Standoff
8086-B-0440-3	Spacing Threaded Standoff

FAQs

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

What is the FSCG of the NSN 5340-01-052-6782?

The FSCG of the NSN 5340-01-052-6782 is 5340

Does NSN 5340-01-052-6782 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 5340-01-052-6782 contain precious materials?

Item does not contain precious metal.

Does NSN 5340-01-052-6782 contain hazardous materials?

Indicates there is no information in the hmirs. The nsn is in a fsc in table ii of fed std 313 and a msds may be required by the user. The requirement for a msds is dependent on a hazard determination of the supplier or the intended end use of item.

When the NSN 5340-01-052-6782 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Sat, Dec 17, 1977