4820-01-083-0257

Find complete technical information, availability, and procurement data for: 4820-01-083-0257
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-083-0257

Item Name Code

22113

Assigment Date

09/14/1979 (46 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.

0.975 inches nominal single threaded portion thread length, 2a single threaded portion thread class, 45.000 nominal seat angle in deg, 7.125 inches nominal body inside diameter, 1.065 inches nominal overall height

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 single threaded portion
Thread Length: 0.975 inches nominal single threaded portion
Overall Height: 1.065 inches nominal
Body Inside Diameter: 7.125 inches nominal
Seat Angle In Deg: 45.000 nominal
Thread Quantity Per Inch: 12 single threaded portion
Nominal Thread Size: 8.250 inches single threaded portion
Seating Surface Shape: angular
Special Features: center guide hub w/3 spokes
Material: steel overall
Style Designator: plain threaded
Thread Series Designator: uns single threaded portion

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
4820-01-185-3238	No Name Available	11/01/1987

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
NM-133-1	Valve Seat
NM-133-1-NK-191-1	Valve Seat
NM-1331-1 AND N	Valve Seat
NM0133-1	Valve Seat
S-1032 PIECE 18	Valve Seat
S-1045PC17 AND	Valve Seat
S-1045PC17-18	Valve Seat
S1032PC17 AND 18	Valve Seat
S1032PC17-18MM1331-1	Valve Seat

FAQs

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

What is the FSCG of the NSN 4820-01-083-0257?

The FSCG of the NSN 4820-01-083-0257 is 4820

Does the NSN 4820-01-083-0257 have a Schedule B code assigned?

Yes, the Schedule B code is 8481909090

Does NSN 4820-01-083-0257 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 4820-01-083-0257 contain precious materials?

Precious metal content is unknown

Does NSN 4820-01-083-0257 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 4820-01-083-0257 was assigned to the Federal Catalog?

It was assigned 46 years ago, on Fri, Sep 14, 1979