AN178C21

View detailed technical data, stock status, and sourcing information for: AN178C21
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-00-177-5510

Item Name Code

27851

Assigment Date

10/20/1969 (56 years ago)

An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes:items with bevel (conical) heads. See bolt, internal wrenching. Excludes:screw, shoulder; and screw, machine.

2.203 inches minimum and 2.250 inches maximum fastener length, 0.749 inches minimum and 0.828 inches maximum thread length, right-hand thread direction, 3a thread class, 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: 0.749 inches minimum and 0.828 inches maximum
Fastener Length: 2.203 inches minimum and 2.250 inches maximum
Head Style: hexagon
Head Height: 0.265 inches minimum and 0.297 inches maximum
Width Between Flats: 0.740 inches minimum and 0.752 inches maximum
Grip Diameter: 0.4986 inches minimum and 0.4991 inches maximum
Shank Unthreaded Hole Diameter: 0.106 inches minimum and 0.116 inches maximum first hole
Nominal Thread Diameter: 0.500 inches
Grip Length: 1.422 inches minimum and 1.454 inches maximum
Thread Quantity Per Inch: 20
Minimum Tensile Strength: 125000 pounds per square inch
Hardness Rating: 26.0 rockwell c minimum and 32.0 rockwell c maximum overall
Distance From Head Largest Bearing Surface To Shank Hole Center: 2.031 inches minimum and 2.063 inches maximum first hole
Material: steel comp 431 overall
Material Document And Classification: mil-s-18732 mil spec single material response overall
Surface Treatment: passivate 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
AN178C21	Close Tolerance Bolt

FAQs

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

What is the FSCG of the NSN 5306-00-177-5510?

The FSCG of the NSN 5306-00-177-5510 is 5306

Does the NSN 5306-00-177-5510 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-00-177-5510 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 5306-00-177-5510 contain precious materials?

Precious metal content is unknown

Does NSN 5306-00-177-5510 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 5306-00-177-5510 was assigned to the Federal Catalog?

It was assigned 56 years ago, on Mon, Oct 20, 1969