991/4/00113/002

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-452-4970

Item Name Code

18257

Assigment Date

05/08/1970 (56 years ago)

An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. The threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. For items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. See also screw, cap, hexagon head and screw, machine.

3a thread class, 0.500 inches minimum and 0.540 inches maximum fastener length, 0.307 inches minimum and 0.440 inches maximum thread length, right-hand thread direction, hexagon head style

Product Characteristics

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

Thread Class: 3a
Thread Direction: right-hand
Thread Length: 0.307 inches minimum and 0.440 inches maximum
Fastener Length: 0.500 inches minimum and 0.540 inches maximum
Head Style: hexagon
Head Height: 0.075 inches minimum and 0.085 inches maximum
Width Between Flats: 0.245 inches minimum and 0.250 inches maximum
Nominal Thread Diameter: 0.138 inches
Thread Quantity Per Inch: 32
Material: steel corrosion resisting 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
79800667003	Hexagon Head Cap Screw
99-1212638	Hexagon Head Cap Screw
991/4/00113/002	Hexagon Head Cap Screw
A104-1B	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-00-452-4970?

The FSCG of the NSN 5305-00-452-4970 is 5305

Does the NSN 5305-00-452-4970 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-00-452-4970 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 5305-00-452-4970 contain precious materials?

Precious metal content is unknown

Does NSN 5305-00-452-4970 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 5305-00-452-4970 was assigned to the Federal Catalog?

It was assigned 56 years ago, on Fri, May 8, 1970