A91906-1

View detailed technical data, stock status, and sourcing information for: A91906-1
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-293-0977

Item Name Code

16282

Assigment Date

01/26/1989 (37 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.

0.816 inches minimum and 1.000 inches maximum thread length, flat chamfer head style, 3a thread class, 0.970 inches minimum and 1.000 inches maximum fastener length, 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: 3a
Thread Direction: right-hand
Thread Length: 0.816 inches minimum and 1.000 inches maximum
Fastener Length: 0.970 inches minimum and 1.000 inches maximum
Head Style: flat chamfer
Head Diameter: 0.735 inches minimum and 0.750 inches maximum
Head Height: 0.492 inches minimum and 0.500 inches maximum
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.500 inches
Width Across Flats: 0.375 inches nominal
Thread Quantity Per Inch: 13
Minimum Tensile Strength: 170000 pounds per square inch
Hardness Rating: 37.0 rockwell c minimum and 45.0 rockwell c maximum overall
Part Name Assigned By Controlling Agency: navy special project
Material: steel comp 4340 overall
Material Document And Classification: astm a574 assn std single material response overall
Thread Series Designator: unc
Nondefinitive Spec/Std Data: 2 type

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
1/2-13UNC-3AX1 IN. LG, STL	Socket Head Cap Screw
A91906-1	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-293-0977?

The FSCG of the NSN 5305-01-293-0977 is 5305

Does the NSN 5305-01-293-0977 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-293-0977 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 5305-01-293-0977 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-293-0977 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 5305-01-293-0977 was assigned to the Federal Catalog?

It was assigned 37 years ago, on Thu, Jan 26, 1989