5306-01-203-8366

Find complete technical information, availability, and procurement data for: 5306-01-203-8366
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-01-203-8366

Item Name Code

27851

Assigment Date

03/20/1985 (41 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.

3a thread class, 3.668 inches minimum and 3.688 inches maximum fastener length, right-hand thread direction, 0.402 inches minimum and 0.438 inches maximum thread length, crowned 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: 0.402 inches minimum and 0.438 inches maximum
Fastener Length: 3.668 inches minimum and 3.688 inches maximum
Head Style: crowned hexagon
Head Height: 0.126 inches minimum and 0.141 inches maximum
Width Between Flats: 0.422 inches minimum and 0.488 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: 3.250 inches minimum and 3.266 inches maximum
Thread Quantity Per Inch: 28
Hardness Rating: 36.0 rockwell c minimum and 41.0 rockwell c maximum overall
Distance From Head Largest Bearing Surface To Shank Hole Center: 3.578 inches minimum and 3.588 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,ty2,cl2 fed spec single treatment response 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
MS27576-4-52	Close Tolerance Bolt

FAQs

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

What is the FSCG of the NSN 5306-01-203-8366?

The FSCG of the NSN 5306-01-203-8366 is 5306

Does the NSN 5306-01-203-8366 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-01-203-8366 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 5306-01-203-8366 contain precious materials?

Item does not contain precious metal.

Does NSN 5306-01-203-8366 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 5306-01-203-8366 was assigned to the Federal Catalog?

It was assigned 41 years ago, on Wed, Mar 20, 1985