A640031C225

View detailed technical data, stock status, and sourcing information for: A640031C225
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-081-2431

Item Name Code

16282

Assigment Date

08/10/1979 (47 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.

right-hand thread direction, fillister head style, 1.120 inches minimum thread length, 2.250 inches nominal fastener length, 3a 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: 3a
Thread Direction: right-hand
Thread Length: 1.120 inches minimum
Fastener Length: 2.250 inches nominal
Head Style: fillister
Head Diameter: 0.457 inches minimum and 0.469 inches maximum
Head Height: 0.306 inches minimum and 0.312 inches maximum
Locking Feature: patch threads
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.312 inches
Width Across Flats: 0.250 inches nominal
Thread Quantity Per Inch: 18
Minimum Tensile Strength: 170000 pounds per square inch
Hardness Rating: 38.0 rockwell c minimum and 45.0 rockwell c maximum overall
Minimum Yield Strength: 150000 pounds per square inch
Special Features: critical item hydrogen embrittlement relief required
Material: steel overall
Material Document And Classification: 66 fed std single material response overall
Surface Treatment: zinc overall
Surface Treatment Document And Classification: qq-z-325,ty 2,cl 3 fed spec single treatment 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
3176207-C-128	Socket Head Cap Screw
A640031C225	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-081-2431?

The FSCG of the NSN 5305-01-081-2431 is 5305

Does the NSN 5305-01-081-2431 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-081-2431 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 5305-01-081-2431 contain precious materials?

Precious metal content is unknown

Does NSN 5305-01-081-2431 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 5305-01-081-2431 was assigned to the Federal Catalog?

It was assigned 47 years ago, on Fri, Aug 10, 1979