0645-0420-16UDH

View detailed technical data, stock status, and sourcing information for: 0645-0420-16UDH
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-273-5637

Item Name Code

16282

Assigment Date

01/01/1963 (63 years ago)

right-hand thread direction, 3a thread class, flat chamfer head style, 0.870 inches minimum and 1.000 inches maximum thread length, 0.970 inches minimum and 1.000 inches maximum fastener 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: 0.870 inches minimum and 1.000 inches maximum
Fastener Length: 0.970 inches minimum and 1.000 inches maximum
Head Style: flat chamfer
Head Diameter: 0.365 inches minimum and 0.375 inches maximum
Head Height: 0.244 inches minimum and 0.250 inches maximum
Hole Diameter: 0.044 inches minimum and 0.050 inches maximum
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.250 inches
Width Across Flats: 0.1875 inches minimum and 0.1900 inches maximum
Hole Quantity: 3
Hole Type: drilled
Thread Quantity Per Inch: 20
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: 150000 pounds per square inch
Hole Configuration Style: round internal hexagon
Material: steel overall
Surface Treatment: cadmium and chromate overall
Surface Treatment Document And Classification: qq-p-416 ty 2 cl 3 fed spec single treatment response overall
Thread Series Designator: unc
Nondefinitive Spec/Std Data: 6 type

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5305-00-051-4881	No Name Available	11/07/1969
5305-00-350-4823	No Name Available	11/01/1982
5305-00-616-6384	No Name Available	07/03/1968

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:

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0645-0420-16UDH	Socket Head Cap Screw
12Z1196-36	Socket Head Cap Screw
298235PC256	Socket Head Cap Screw
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479183PC6	Socket Head Cap Screw
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5305-273-5637	Socket Head Cap Screw
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5580-6	Socket Head Cap Screw
69994-4-10C	Socket Head Cap Screw
935064	Socket Head Cap Screw
MS24677-37	Socket Head Cap Screw
MS24677-37C	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-00-273-5637?

The FSCG of the NSN 5305-00-273-5637 is 5305

Does the NSN 5305-00-273-5637 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-00-273-5637 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 5305-00-273-5637 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-00-273-5637 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 5305-00-273-5637 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963