91251A638

View detailed technical data, stock status, and sourcing information for: 91251A638
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-325-1973

Item Name Code

16282

Assigment Date

08/30/1990 (35 years ago)

An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes:items with bevel (conical) heads. See bolt, internal wrenching. Excludes:screw, shoulder; and screw, machine.

knurled no. 1 head style, 1.250 inches nominal thread length, 3.500 inches nominal fastener length, right-hand thread direction, 2a thread class

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: 3.500 inches nominal
Head Style: knurled no. 1
Head Diameter: 0.550 inches minimum and 0.562 inches maximum
Head Height: 0.368 inches minimum and 0.375 inches maximum
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.375 inches
Width Across Flats: 0.312 inches nominal
Thread Quantity Per Inch: 16
Minimum Tensile Strength: 180000 pounds per square inch
Hardness Rating: 39.0 rockwell c minimum and 45.0 rockwell c maximum overall
Color: black overall
Material: steel overall
Material Document And Classification: sae grade 8 assn std single material response overall
Surface Treatment: oxide 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
91251A638	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-325-1973?

The FSCG of the NSN 5305-01-325-1973 is 5305

Does the NSN 5305-01-325-1973 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-325-1973 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 5305-01-325-1973 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-325-1973 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 5305-01-325-1973 was assigned to the Federal Catalog?

It was assigned 35 years ago, on Thu, Aug 30, 1990