N78311B

View detailed technical data, stock status, and sourcing information for: N78311B
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-00-021-8564

Item Name Code

01857

Assigment Date

01/01/1961 (65 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.)

0.250 inches nominal nut height, 0.563 inches nominal width across flats, 2b thread class, hexagon nut style, right-hand thread direction

Product Characteristics

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

Thread Class: 2b
Thread Direction: right-hand
Nut Style: hexagon
Nut Height: 0.250 inches nominal
Width Across Flats: 0.563 inches nominal
Thread Series: unf
Thread Quantity Per Inch: 24
Nominal Thread Size: 0.312 inches
Bearing Surface Type: washer faced
Material: steel overall
Material Document And Classification: qq-s-633-canc fed spec single material response overall
Nondefinitive Spec/Std Data: a type
Departure From Cited Document: as modified by nut height

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
187197	Hexagon Plain Nut
57411	Hexagon Plain Nut
BB19349	Hexagon Plain Nut
N78311B	Hexagon Plain Nut
NF5H	Hexagon Plain Nut
NU112	Hexagon Plain Nut
Q1903	Hexagon Plain Nut
R20926	Hexagon Plain Nut
S1863	Hexagon Plain Nut
X18203	Hexagon Plain Nut
X4-14	Hexagon Plain Nut

FAQs

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

What is the FSCG of the NSN 5310-00-021-8564?

The FSCG of the NSN 5310-00-021-8564 is 5310

Does the NSN 5310-00-021-8564 have a Schedule B code assigned?

Yes, the Schedule B code is 7318160000

Does NSN 5310-00-021-8564 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 5310-00-021-8564 contain precious materials?

Precious metal content is unknown

Does NSN 5310-00-021-8564 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 5310-00-021-8564 was assigned to the Federal Catalog?

It was assigned 65 years ago, on Sun, Jan 1, 1961