Seat, Valve4820-01-457-9020

NSN 4820-01-457-9020 · NIIN 014579020

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-457-9020 · 4820014579020 · NIIN 014579020 · 01-457-9020 · FSC 4820 Valves, Nonpowered · 803-1385623-08XX-68 · 1385623

Nearby stock numbers ← 4820-01-457-9000 Valve, Hold, Boom Hoist Cylinder · 4820-01-457-9028 Valve Assembly →

4820-01-457-9020 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
Flange Seat to Disk End Height: 0.343 INCHES NOMINAL IN
Flange Diameter: 9.188 INCHES NOMINAL IN
Thread Length: 0.750 INCHES NOMINAL SINGLE THREADED PORTION IN
Style Designator: THREADED FLANGED
Body Inside Diameter: 7.966 INCHES NOMINAL IN
Nominal Thread Size: 8.750 INCHES SINGLE THREADED PORTION IN
Under Flange Height: 0.875 INCHES NOMINAL IN

Identification

NSN: 4820-01-457-9020
NIIN: 014579020
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-457-9020, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-457-9020
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Flange Seat to Disk End Height	0.343 INCHES NOMINAL IN
Flange Diameter	9.188 INCHES NOMINAL IN
Thread Length	0.750 INCHES NOMINAL SINGLE THREADED PORTION IN
Style Designator	THREADED FLANGED
Body Inside Diameter	7.966 INCHES NOMINAL IN
Nominal Thread Size	8.750 INCHES SINGLE THREADED PORTION IN
Under Flange Height	0.875 INCHES NOMINAL IN
Thread Class	3A SINGLE THREADED PORTION A
Thread Quantity Per Inch	12 SINGLE THREADED PORTION
Material	NICKEL ALLOY SEAT
Thread Series Designator	UNS SINGLE THREADED PORTION
Seating Surface Shape	FLAT

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
803-1385623-08XX-68	3/2 Design control — primary reference U.S. Government activity
1385623	D/9 Drawing number reference only U.S. Government activity

No interchangeability data on file.

Other items in FSC 4820 — Valves, Nonpowered

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4820-00-000-0097

4820-00-000-0097 · Item name not on file

4820-00-001-0010

VALVE,ROTARY,SELECTOR

4820-00-001-0020

4820-00-001-0020 · Item name not on file

4820-00-001-0021

4820-00-001-0021 · Item name not on file

4820-00-001-0032

4820-00-001-0032 · Item name not on file

4820-00-001-0037

VALVE,SAFETY RELIEF

4820-00-001-0042

4820-00-001-0042 · Item name not on file

4820-00-001-1230

4820-00-001-1230 · Item name not on file

Frequently Asked Questions

What is NSN 4820-01-457-9020?

NSN 4820-01-457-9020 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What are the specifications of 4820-01-457-9020?

Key specifications for 4820-01-457-9020: Flange Seat to Disk End Height: 0.343 INCHES NOMINAL IN; Flange Diameter: 9.188 INCHES NOMINAL IN; Thread Length: 0.750 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 12 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-457-9020 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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