AN173-25A

View detailed technical data, stock status, and sourcing information for: AN173-25A
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-00-182-1773

Item Name Code

27851

Assigment Date

01/01/1963 (63 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.

hexagon head style, right-hand thread direction, 0.406 inches minimum thread length, 2.656 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: 0.406 inches minimum
Fastener Length: 2.656 inches nominal
Head Style: hexagon
Head Height: 0.109 inches minimum and 0.141 inches maximum
Width Between Flats: 0.365 inches minimum and 0.377 inches maximum
Grip Diameter: 0.1889 inches minimum and 0.1894 inches maximum
Nominal Thread Diameter: 0.190 inches
Grip Length: 2.625 inches nominal
Thread Quantity Per Inch: 32
Minimum Tensile Strength: 125000 pounds per square inch
Hardness Rating: 26.0 rockwell c minimum and 32.0 rockwell c maximum overall
Surface Finish: 63.0 microinches bearing surface of head
Surface Finish: 63.0 microinches grip
Material: steel comp 8740 or steel comp 8630 or steel comp 8735 or steel comp 4140 or steel comp 4130 or steel comp 4037 overall
Material Document And Classification: mil-s-6049 mil spec 1st material response or mil-s-6050 mil spec 2nd material response or mil-s-6098 mil spec 3rd material response or mil-s-5626 mil spec 4th material response or mil-s-6758 mil spec 5th material response or ams 6300 assn std 6th material response overall
Surface Treatment: cadmium and chromate overall
Surface Treatment Document And Classification: qq-p-416,ty 2,cl 3 fed spec all treatment responses 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
AN173-25A	Close Tolerance Bolt

FAQs

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

What is the FSCG of the NSN 5306-00-182-1773?

The FSCG of the NSN 5306-00-182-1773 is 5306

Does the NSN 5306-00-182-1773 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-00-182-1773 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 5306-00-182-1773 contain precious materials?

Item does not contain precious metal.

Does NSN 5306-00-182-1773 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 5306-00-182-1773 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963