803-2177917-2-17

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-143-9781

Item Name Code

18257

Assigment Date

01/10/1973 (53 years ago)

An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. The threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. The thread length being the controlled dimension, the grip length is not specified. A locking feature may be incorporated in the design of the head or threads. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. Excludes:bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.

hexagon head style, 1.250 inches nominal thread length, right-hand thread direction, 2a thread class, 2.500 inches nominal 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: 1.250 inches nominal
Fastener Length: 2.500 inches nominal
Head Style: hexagon
Head Height: 0.302 inches minimum and 0.364 inches maximum
Width Between Flats: 0.725 inches minimum and 0.750 inches maximum
Nominal Thread Diameter: 0.500 inches
Thread Quantity Per Inch: 13
Minimum Tensile Strength: 80000 pounds per square inch
Hardness Rating: 80.0 rockwell b minimum overall
Minimum Yield Strength: 40000 pounds per square inch
Material: nickel alloy 400 overall
Material Document And Classification: qq-n-281 class a fed spec single material response overall
Thread Series Designator: unc

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
2663140OC87	Hexagon Head Cap Screw
49651-79X1-87	Hexagon Head Cap Screw
803-2177917-2-17	Hexagon Head Cap Screw
MIL-DTL-1222J	Hexagon Head Cap Screw
MIL-S-1222 TY1 GR 400	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-00-143-9781?

The FSCG of the NSN 5305-00-143-9781 is 5305

Does the NSN 5305-00-143-9781 have a Schedule B code assigned?

Yes, the Schedule B code is 7508900000

Does NSN 5305-00-143-9781 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 5305-00-143-9781 contain precious materials?

Precious metal content is unknown

Does NSN 5305-00-143-9781 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 5305-00-143-9781 was assigned to the Federal Catalog?

It was assigned 53 years ago, on Wed, Jan 10, 1973