BK206640210

View detailed technical data, stock status, and sourcing information for: BK206640210
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-01-347-4305

Item Name Code

01857

Assigment Date

10/21/1991 (34 years ago)

A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)

mk21mod1 diving helmet-superlite-air/mixed end item identification, 0.750 inches nominal width across flats, 0.230 inches minimum and 0.250 inches maximum nut height, hexagon nut style, feat criticality code justification

Product Characteristics

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

Nut Style: hexagon
Nut Height: 0.230 inches minimum and 0.250 inches maximum
End Item Identification: mk21mod1 diving helmet-superlite-air/mixed
Width Across Flats: 0.750 inches nominal
Criticality Code Justification: feat
Special Features: underwater life support iaw navsea instruction 10560.2b

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
550-040	Hexagon Plain Nut
592-6318146	Hexagon Plain Nut
6318146	Hexagon Plain Nut
BK206640210	Hexagon Plain Nut

FAQs

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

What is the FSCG of the NSN 5310-01-347-4305?

The FSCG of the NSN 5310-01-347-4305 is 5310

Does the NSN 5310-01-347-4305 have a Schedule B code assigned?

Yes, the Schedule B code is 7318160000

Does NSN 5310-01-347-4305 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 5310-01-347-4305 contain precious materials?

Item does not contain precious metal.

Does NSN 5310-01-347-4305 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 5310-01-347-4305 was assigned to the Federal Catalog?

It was assigned 34 years ago, on Mon, Oct 21, 1991