6643072 PIECE 6

View detailed technical data, stock status, and sourcing information for: 6643072 PIECE 6
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-00-191-3942

Item Name Code

06666

Assigment Date

03/16/1970 (56 years ago)

An externally threaded fastener whose threaded portion is of one nominal diameter, no. 10 (0.190 in.) (5 mm) or larger. It is designed with an internal socket or internal multiple spline for use with an internal driver. The head is beveled (conical) or cylindrical in shape. Items with cylindrical shaped heads must have an externally relieved body. A locking feature may be incorporated in the design of the head or threads. See also screw, cap, socket head. Excludes:setscrew; screw, shoulder; bolt, shoulder; screw, externally relieved body; bolt, externally relieved body; and screw, machine.

right-hand thread direction, 0.750 inches nominal fastener length, 0.562 inches nominal head diameter, 3a thread class, 0.562 inches minimum thread length

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: 0.562 inches minimum
Fastener Length: 0.750 inches nominal
Head Diameter: 0.562 inches nominal
Head Height: 0.359 inches minimum and 0.391 inches maximum
First Diameter From Head: 0.271 inches minimum and 0.281 inches maximum
Distance From Largest Bearing Surface Of Head To End Of First Diameter: 0.188 inches nominal
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.375 inches
Width Across Flats: 0.312 inches nominal
Thread Quantity Per Inch: 16
Surface Finish: 63.0 microinches bearing surface of head
Part Name Assigned By Controlling Agency: navy special project
Material: steel overall
Thread Series Designator: unc

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
6643072 PIECE 6	Internal Wrenching Bolt

FAQs

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

What is the FSCG of the NSN 5306-00-191-3942?

The FSCG of the NSN 5306-00-191-3942 is 5306

Does the NSN 5306-00-191-3942 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-00-191-3942 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 5306-00-191-3942 contain precious materials?

Item does not contain precious metal.

Does NSN 5306-00-191-3942 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 5306-00-191-3942 was assigned to the Federal Catalog?

It was assigned 56 years ago, on Mon, Mar 16, 1970