639AS872

View detailed technical data, stock status, and sourcing information for: 639AS872
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-070-8171

Item Name Code

16282

Assigment Date

01/20/1979 (47 years ago)

A high strength, 160,000 pounds per square inch (1100 megapascals) minimum tensile strength externally threaded fastener designed for use in applications involving great shear stress. The head is designed to accommodate an external wrench or driver. The head is not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. The unthreaded portion is of specific grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. A locking feature may be incorporated in the design of the head or threads. See bolt, machine and bolt, clevis.

0.250 inches nominal thread length, 0.375 inches nominal fastener length, right-hand thread direction, 3a thread class, pan no. 2 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: 0.250 inches nominal
Fastener Length: 0.375 inches nominal
Head Style: pan no. 2
Head Diameter: 0.134 inches minimum and 0.140 inches maximum
Head Height: 0.083 inches minimum and 0.086 inches maximum
Locking Feature: pellet threads
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.086 inches
Width Across Flats: 0.078 inches minimum and 0.079 inches maximum
Thread Quantity Per Inch: 56
Hardness Rating: 80.0 rockwell b nominal overall
Minimum Yield Strength: 30000 pounds per square inch
Material: steel corrosion resisting or nickel alloy overall
Material Document And Classification: qq-s-763,comp 302 or 303 or304 or 305 or 316 fed spec single material response or 66,302 or 303 or304 or 305 or 316 or 16-18 or 18-8 fed std single material response overall
Surface Treatment: passivate overall
Surface Treatment Document And Classification: qq-p-35 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
639AS872	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-070-8171?

The FSCG of the NSN 5305-01-070-8171 is 5305

Does NSN 5305-01-070-8171 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 5305-01-070-8171 contain precious materials?

Precious metal content is unknown

Does NSN 5305-01-070-8171 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 5305-01-070-8171 was assigned to the Federal Catalog?

It was assigned 47 years ago, on Sat, Jan 20, 1979