S371-4-4

View detailed technical data, stock status, and sourcing information for: S371-4-4
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-00-352-0457

Item Name Code

15903

Assigment Date

02/02/1974 (52 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.

double hexagon w/hole head style, right-hand thread direction, 0.443 inches minimum and 0.493 inches maximum thread length, 0.703 inches minimum and 0.733 inches maximum 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: 0.443 inches minimum and 0.493 inches maximum
Fastener Length: 0.703 inches minimum and 0.733 inches maximum
Head Style: double hexagon w/hole
Head Height: 0.290 inches minimum and 0.310 inches maximum
Width Between Flats: 0.304 inches minimum and 0.313 inches maximum
Extended Washer Diameter: 0.428 inches minimum and 0.438 inches maximum
Extended Washer Thickness: 0.059 inches minimum and 0.079 inches maximum
Grip Diameter: 0.2490 inches minimum and 0.2495 inches maximum
Nominal Thread Diameter: 0.250 inches
Grip Length: 0.240 inches minimum and 0.260 inches maximum
Thread Quantity Per Inch: 28
Minimum Tensile Strength: 220000 pounds per square inch
Material: steel corrosion resisting overall
Surface Treatment: passivate overall
Thread Series Designator: unjf

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
74328-4-4	Shear Bolt
AIC752-4-4	Shear Bolt
BM3326-4-4	Shear Bolt
MB84-4-4	Shear Bolt
S11-1059-4-4	Shear Bolt
S371-4-4	Shear Bolt
ST3M571-4-4	Shear Bolt
VAL23033-4-4	Shear Bolt
VS3060-4-4	Shear Bolt

FAQs

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

What is the FSCG of the NSN 5306-00-352-0457?

The FSCG of the NSN 5306-00-352-0457 is 5306

Does the NSN 5306-00-352-0457 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-00-352-0457 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 5306-00-352-0457 contain precious materials?

Precious metal content is unknown

Does NSN 5306-00-352-0457 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 5306-00-352-0457 was assigned to the Federal Catalog?

It was assigned 52 years ago, on Sat, Feb 2, 1974