5306-00-251-2181

Find complete technical information, availability, and procurement data for: 5306-00-251-2181
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-00-251-2181

Item Name Code

06675

Assigment Date

06/13/1973 (53 years ago)

0.656 inches minimum and 0.718 inches maximum thread length, square head style, 1.094 inches minimum and 1.156 inches maximum fastener length, 3a thread class, right-hand thread direction

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: 0.656 inches minimum and 0.718 inches maximum
Fastener Length: 1.094 inches minimum and 1.156 inches maximum
Head Style: square
Head Height: 0.155 inches minimum and 0.160 inches maximum
Width Between Flats: 1.094 inches minimum and 1.156 inches maximum
First Diameter From Head: 0.620 inches minimum and 0.625 inches maximum
Second Diameter From Head: 0.499 inches minimum and 0.501 inches maximum
Distance From Largest Bearing Surface Of Head To End Of First Diameter: 0.219 inches minimum and 0.281 inches maximum
Distance From Largest Bearing Surface Of Head To End Of Second Diameter: 0.313 inches minimum and 0.385 inches maximum
Nominal Thread Diameter: 0.625 inches
Thread Quantity Per Inch: 18
Hardness Rating: 30.0 rockwell c minimum and 34.0 rockwell c maximum overall
Externally Relieved Body Diameter Quantity: 2
Material: steel overall
Surface Treatment: cadmium overall
Thread Series Designator: unf

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5306-00-227-7157	No Name Available	05/01/1983

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
4X181C1	Externally Relieved Body Bolt

FAQs

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

What is the FSCG of the NSN 5306-00-251-2181?

The FSCG of the NSN 5306-00-251-2181 is 5306

Does the NSN 5306-00-251-2181 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-00-251-2181 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 5306-00-251-2181 contain precious materials?

Precious metal content is unknown

Does NSN 5306-00-251-2181 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 5306-00-251-2181 was assigned to the Federal Catalog?

It was assigned 53 years ago, on Wed, Jun 13, 1973