5306-01-021-1871

Find complete technical information, availability, and procurement data for: 5306-01-021-1871
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-01-021-1871

Item Name Code

27851

Assigment Date

05/10/1976 (50 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.

3a thread class, right-hand thread direction, 0.282 inches minimum and 0.333 inches maximum thread length, 2.918 inches minimum and 2.938 inches maximum fastener length, dished hexagon 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: 0.282 inches minimum and 0.333 inches maximum
Fastener Length: 2.918 inches minimum and 2.938 inches maximum
Head Style: dished hexagon
Head Height: 0.126 inches minimum and 0.141 inches maximum
Width Between Flats: 0.430 inches minimum and 0.439 inches maximum
Grip Diameter: 0.2483 inches minimum and 0.2492 inches maximum
Shank Unthreaded Hole Diameter: 0.076 inches minimum and 0.086 inches maximum first hole
Nominal Thread Diameter: 0.250 inches
Grip Length: 2.500 inches minimum and 2.516 inches maximum
Thread Quantity Per Inch: 28
Minimum Tensile Strength: 95000 pounds per square inch
Hardness Rating: 36.0 rockwell c minimum and 41.0 rockwell c maximum overall
Distance From Head Largest Bearing Surface To Shank Hole Center: 2.818 inches minimum and 2.848 inches maximum first hole
Surface Finish: 63.0 microinches bearing surface of head
Surface Finish: 63.0 microinches grip
Special Features: retaining element in shank
Material: steel comp e4340 or steel comp 4140 or steel comp 8740 or steel comp 4130 or steel comp 6150 overall
Surface Treatment: cadmium and chromate overall
Surface Treatment Document And Classification: qq-p-416,ty 2,cl 2 fed spec single treatment response overall
Thread Series Designator: unjf

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5306-01-079-1367	No Name Available	12/01/1985

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
106467-4-40	Close Tolerance Bolt
AS194-4-40	Close Tolerance Bolt
CA4510-4-40	Close Tolerance Bolt
MS27576-4-40	Close Tolerance Bolt

FAQs

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

What is the FSCG of the NSN 5306-01-021-1871?

The FSCG of the NSN 5306-01-021-1871 is 5306

Does the NSN 5306-01-021-1871 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-01-021-1871 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 5306-01-021-1871 contain precious materials?

Item does not contain precious metal.

Does NSN 5306-01-021-1871 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 5306-01-021-1871 was assigned to the Federal Catalog?

It was assigned 50 years ago, on Mon, May 10, 1976