490278

View detailed technical data, stock status, and sourcing information for: 490278
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-00-989-5079

Item Name Code

29729

Assigment Date

02/01/1995 (31 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.)

3b thread class, right-hand thread direction, 0.396 inches minimum and 0.411 inches maximum overall height, prevailing torque all metal design locking feature, 0.433 inches minimum and 0.443 inches maximum washer outside diameter

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: prevailing torque all metal design
Washer Outside Diameter: 0.433 inches minimum and 0.443 inches maximum
Overall Height: 0.396 inches minimum and 0.411 inches maximum
Nut Style: double hexagon
Washer Thickness: 0.060 inches minimum and 0.080 inches maximum
Width Across Flats: 0.367 inches minimum and 0.376 inches maximum
Thread Series: unjf
Thread Quantity Per Inch: 28
Nominal Thread Size: 0.250 inches
Material: nickel alloy overall
Precious Material: silver
Surface Treatment: silver 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
4900278	Extended Washer Self-Locking Nut
490278	Extended Washer Self-Locking Nut
59854-428	Extended Washer Self-Locking Nut
B00101-4	Extended Washer Self-Locking Nut
ST1325-10	Extended Washer Self-Locking Nut

FAQs

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

What is the FSCG of the NSN 5310-00-989-5079?

The FSCG of the NSN 5310-00-989-5079 is 5310

Does the NSN 5310-00-989-5079 have a Schedule B code assigned?

Yes, the Schedule B code is 7508900000

Does NSN 5310-00-989-5079 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 5310-00-989-5079 contain precious materials?

Item contains silver.

Does NSN 5310-00-989-5079 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 5310-00-989-5079 was assigned to the Federal Catalog?

It was assigned 31 years ago, on Wed, Feb 1, 1995