C-81.121-274825

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-056-1501

Item Name Code

18257

Assigment Date

02/17/1978 (48 years ago)

hexagon extended washer head style, 0.670 inches minimum and 0.750 inches maximum thread length, 2a thread class, right-hand thread direction, 0.720 inches minimum and 0.750 inches maximum 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: 0.670 inches minimum and 0.750 inches maximum
Fastener Length: 0.720 inches minimum and 0.750 inches maximum
Head Style: hexagon extended washer
Head Height: 0.204 inches minimum and 0.222 inches maximum
Width Between Flats: 0.367 inches minimum and 0.375 inches maximum
Extended Washer Diameter: 0.513 inches minimum and 0.531 inches maximum
Extended Washer Thickness: 0.019 inches minimum and 0.028 inches maximum
Nominal Thread Diameter: 0.250 inches
Thread Quantity Per Inch: 20
Minimum Tensile Strength: 115000 pounds per square inch
Hardness Rating: 22.0 rockwell c minimum and 35.0 rockwell c maximum overall
Special Features: washer bearin surface serrated
Material: steel comp 1018 or steel comp 1021 or steel comp 1022 overall
Material Document And Classification: sae assn std single material response overall
Surface Treatment: zinc overall
Thread Series Designator: unc

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5306-00-204-4990	No Name Available	02/01/1999

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
274825	Hexagon Head Cap Screw
88-20260-32	Hexagon Head Cap Screw
C-81.121-274825	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-056-1501?

The FSCG of the NSN 5305-01-056-1501 is 5305

Does the NSN 5305-01-056-1501 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-056-1501 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 5305-01-056-1501 contain precious materials?

Precious metal content is unknown

Does NSN 5305-01-056-1501 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 5305-01-056-1501 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Fri, Feb 17, 1978