4820-01-181-8657

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Valve Seat

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Official Item Classification

Name: Valve Seat
(NSN) National Stock Number: 4820-01-181-8657
(FSG) Federal Supply Group: 48 Valves
(FSC) Federal Supply Classification: 4820 Nonpowered Valves
(INC) Item Name Code: 22113
(FIIG) Federal Item Identification Guide: A15500
Date: 06/16/1984 (42 years ago)

0.634 inches nominal overall height, 4.250 inches nominal body inside diameter, 2a single threaded portion thread class, 12 single threaded portion thread quantity per inch, 0.500 inches nominal single threaded portion thread length

Specs & Compatibility

Thread Class

2a single threaded portion

Thread Length

0.500 inches nominal single threaded portion

Overall Height

0.634 inches nominal

Body Inside Diameter

4.250 inches nominal

Thread Quantity Per Inch

12 single threaded portion

Nominal Thread Size

5.375 inches single threaded portion

Seating Surface Shape

flat

Special Features

w/2 std wrench notches on the id

Material

nickel alloy overall

Style Designator

plain threaded

Thread Series Designator

un single threaded portion

Regulatory Compliance

Precious Metals Indicator

Item does not contain precious metal.

Criticality Code

The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Hazardous Metals Indicator

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

Pseudo Item Name Code

0022113

Related Hardware Products

Part Number	Description
208-4325303	Valve Seat
208-4325303 PIECE 9	Valve Seat
6553-255 PIECE 9	Valve Seat

Frequently Asked Questions

What is the FSCG of the NSN 4820-01-181-8657?

The FSCG of the NSN 4820-01-181-8657 is 4820

Does the NSN 4820-01-181-8657 have a Schedule B code assigned?

Yes, the Schedule B code is 8481909090

Does NSN 4820-01-181-8657 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 4820-01-181-8657 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-181-8657 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 4820-01-181-8657 was assigned to the Federal Catalog?

It was assigned 42 years ago, on Sat, Jun 16, 1984