5305-01-438-7478

Find complete technical information, availability, and procurement data for: 5305-01-438-7478
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-438-7478

Item Name Code

06657

Assigment Date

11/19/1996 (29 years ago)

A metal ring designed to provide a seating surface for a valve, poppet, engine it is made of special high-grade alloy metal that can withstand high operating temperatures. For fluid valves, see seat, valve.

1.000 inches nominal fastener length, 0.473 inches minimum and 0.492 inches maximum head diameter, pan head style, 1.000 inches nominal thread length, 2a thread class

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class: 2a
Thread Length: 1.000 inches nominal
Fastener Length: 1.000 inches nominal
Head Style: pan
Head Diameter: 0.473 inches minimum and 0.492 inches maximum
Head Height: 0.130 inches minimum and 0.144 inches maximum
Internal Drive Style: slot
Nominal Thread Diameter: 0.250 inches
Thread Quantity Per Inch: 20
Screw Material: steel corrosion resisting
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
1/4-20UNC-2A LG =1 FF-S-92 TYP	Machine Screw
1/4-20UNC-2A LG-1 FF-S-92 TYP 1	Machine Screw
167-7044218-57	Machine Screw

FAQs

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

What is the FSCG of the NSN 5305-01-438-7478?

The FSCG of the NSN 5305-01-438-7478 is 5305

Does the NSN 5305-01-438-7478 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-438-7478 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 5305-01-438-7478 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-438-7478 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 5305-01-438-7478 was assigned to the Federal Catalog?

It was assigned 29 years ago, on Tue, Nov 19, 1996