5305-01-159-8551

Find complete technical information, availability, and procurement data for: 5305-01-159-8551
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-159-8551

Item Name Code

18257

Assigment Date

08/14/1983 (42 years ago)

An externally threaded fastener whose unthreaded portion is of a specified 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. 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. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see bolt, shear. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see bolt, machine.

2.156 inches minimum and 2.250 inches maximum fastener length, right-hand thread direction, 2a thread class, dished hexagon head style, 0.750 inches minimum thread length

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: 0.750 inches minimum
Fastener Length: 2.156 inches minimum and 2.250 inches maximum
Head Style: dished hexagon
Head Height: 0.172 inches minimum and 0.190 inches maximum
Width Between Flats: 0.428 inches minimum and 0.437 inches maximum
Nominal Thread Diameter: 0.250 inches
Thread Quantity Per Inch: 20
Minimum Tensile Strength: 60000 pounds per square inch
Hardness Rating: 70.0 rockwell b minimum and 100.0 rockwell b maximum overall
Minimum Yield Strength: 36000 pounds per square inch
Special Features: furnished with one spring lockwasher
Material: steel overall
Material Document And Classification: sae assn std all material responses overall
Surface Treatment: cadmium or zinc overall
Surface Treatment Document And Classification: bw101b-p mfr ref 1st treatment response or bw-162a-p mfr ref 2nd 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
2AH985	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-159-8551?

The FSCG of the NSN 5305-01-159-8551 is 5305

Does the NSN 5305-01-159-8551 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-159-8551 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 5305-01-159-8551 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-159-8551 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 5305-01-159-8551 was assigned to the Federal Catalog?

It was assigned 42 years ago, on Sun, Aug 14, 1983