2640-680X2 PIECE 18

View detailed technical data, stock status, and sourcing information for: 2640-680X2 PIECE 18
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-046-7989

Item Name Code

16282

Assigment Date

08/23/1977 (48 years ago)

An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. The threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. For items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. See also screw, cap, hexagon head and screw, machine.

1.500 inches minimum thread length, 1.940 inches minimum and 2.000 inches maximum fastener length, flat chamfer head style, 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: 1.500 inches minimum
Fastener Length: 1.940 inches minimum and 2.000 inches maximum
Head Style: flat chamfer
Head Diameter: 0.735 inches minimum and 0.750 inches maximum
Head Height: 0.492 inches minimum and 0.500 inches maximum
Internal Drive Style: hexagon
End Item Identification: logistgics support vessel
Nominal Thread Diameter: 0.500 inches
Width Across Flats: 0.375 inches minimum and 0.379 inches maximum
Thread Quantity Per Inch: 13
Minimum Tensile Strength: 180000 pounds per square inch
Hardness Rating: 38.0 rockwell c minimum and 45.0 rockwell c maximum overall
Minimum Yield Strength: 155000 pounds per square inch
Material: steel overall
Surface Treatment: cadmium overall
Thread Series Designator: unrc

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
2640-680X2 PIECE 18	Socket Head Cap Screw
NAS1352-8-32P	Socket Head Cap Screw
SS845-2180772 PIECE 18	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-046-7989?

The FSCG of the NSN 5305-01-046-7989 is 5305

Does the NSN 5305-01-046-7989 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-046-7989 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 5305-01-046-7989 contain precious materials?

Precious metal content is unknown

Does NSN 5305-01-046-7989 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 5305-01-046-7989 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Tue, Aug 23, 1977