42657A

View detailed technical data, stock status, and sourcing information for: 42657A
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Federal Supply Group

Valves

Federal Supply Classification

4810 Powered Valves

National Stock Number

4810-01-054-6397

Item Name Code

77777

Assigment Date

01/23/1978 (48 years ago)

A replaceable item designed to provide a stationary seating surface for a mating, moveable item such as a valve disk or the like. The body may have a flange of various shapes. For diesel and gasoline reciprocating engines, see insert, engine valve seat.

matl cres 302 per qq-s-763 or cres 303 per qq-s-764; passivate per qq-p-35; distance under flange 0.435 in. nom; body dia 1.430 in. nom; hex flange distance across flats 1.625 in. nom; thread external 1.625-16 unj-3a; body outer dia 1.540 in. nom; nha av1161 general characteristics item description, f16 end item identification

Product Characteristics

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

End Item Identification: f16
General Characteristics Item Description: matl cres 302 per qq-s-763 or cres 303 per qq-s-764; passivate per qq-p-35; distance under flange 0.435 in. nom; body dia 1.430 in. nom; hex flange distance across flats 1.625 in. nom; thread external 1.625-16 unj-3a; body outer dia 1.540 in. nom; nha av1161

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
42657A	Retainer
585235-1	Retainer

FAQs

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

What is the FSCG of the NSN 4810-01-054-6397?

The FSCG of the NSN 4810-01-054-6397 is 4810

Does the NSN 4810-01-054-6397 have a Schedule B code assigned?

Yes, the Schedule B code is 7326908695

Does NSN 4810-01-054-6397 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 4810-01-054-6397 contain precious materials?

Item does not contain precious metal.

Does NSN 4810-01-054-6397 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 4810-01-054-6397 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Mon, Jan 23, 1978