293031-17

View detailed technical data, stock status, and sourcing information for: 293031-17
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-057-4278

Item Name Code

18257

Assigment Date

03/13/1978 (48 years ago)

A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (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. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.

1.960 inches minimum and 2.040 inches maximum fastener length, 1.737 inches minimum and 1.940 inches maximum thread length, right-hand thread direction, hexagon head style, 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: 1.737 inches minimum and 1.940 inches maximum
Fastener Length: 1.960 inches minimum and 2.040 inches maximum
Head Style: hexagon
Head Height: 0.480 inches minimum and 0.520 inches maximum
Width Between Flats: 0.375 inches nominal
Nominal Thread Diameter: 0.312 inches
Thread Quantity Per Inch: 23
Special Features: spherical radius on thread end
Material: steel comp 4340 overall
Surface Treatment: oxide overall
Thread Series Designator: unf

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
293031-17	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-057-4278?

The FSCG of the NSN 5305-01-057-4278 is 5305

Does the NSN 5305-01-057-4278 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-057-4278 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 5305-01-057-4278 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-057-4278 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 5305-01-057-4278 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Mon, Mar 13, 1978