Seat, Valve4820-01-217-9972

NSN 4820-01-217-9972 · NIIN 012179972

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-217-9972 · 4820012179972 · NIIN 012179972 · 01-217-9972 · FSC 4820 Valves, Nonpowered · NAP 804 PIECE 4 · NAP 804 · P8426A

Nearby stock numbers ← 4820-01-217-9971 · 4820-01-217-9973 Seat, Valve →

4820-01-217-9972 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
Flange Seat to Disk End Height: 0.625 INCHES NOMINAL IN
Flange Diameter: 4.250 INCHES NOMINAL IN
Body Outside Diameter: 1.688 INCHES NOMINAL IN
Thread Length: 0.625 INCHES NOMINAL SINGLE THREADED PORTION IN
Body Inside Diameter: 0.880 INCHES NOMINAL IN
Nominal Thread Size: 4.250 INCHES SINGLE THREADED PORTION IN
Seat Radius: 0.062 INCHES NOMINAL IN

Identification

NSN: 4820-01-217-9972
NIIN: 012179972
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-217-9972, 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12 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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	4820-01-217-9972
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Flange Seat to Disk End Height	0.625 INCHES NOMINAL IN
Flange Diameter	4.250 INCHES NOMINAL IN
Body Outside Diameter	1.688 INCHES NOMINAL IN
Thread Length	0.625 INCHES NOMINAL SINGLE THREADED PORTION IN
Body Inside Diameter	0.880 INCHES NOMINAL IN
Nominal Thread Size	4.250 INCHES SINGLE THREADED PORTION IN
Seat Radius	0.062 INCHES NOMINAL IN
Under Flange Height	1.125 INCHES NOMINAL IN
Thread Class	3A SINGLE THREADED PORTION A
Material	STEEL CORROSION RESISTING OVERALL
Thread Series Designator	UNF SINGLE THREADED PORTION
Seating Surface Shape	RADIAL

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
NAP 804 PIECE 4	5/9 Secondary reference Atlas Valve Co
NAP 804	D/9 Drawing number reference only Atlas Valve Co
P8426A	3/9 Design control — primary reference Atlas Valve Co

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 4820-01-217-9972?

NSN 4820-01-217-9972 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What are the specifications of 4820-01-217-9972?

Key specifications for 4820-01-217-9972: Flange Seat to Disk End Height: 0.625 INCHES NOMINAL IN; Flange Diameter: 4.250 INCHES NOMINAL IN; Body Outside Diameter: 1.688 INCHES NOMINAL IN; Thread Length: 0.625 INCHES NOMINAL SINGLE THREADED PORTION IN. 12 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-217-9972 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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