PartsTable TECHNICAL DATA SHEET

NSN 4820-01-276-3291Government record, cited

Seat, Valve4820-01-276-3291

NSN 4820-01-276-3291 · NIIN 012763291 · Part number A-9907-M-166 6IN SR

The Walworth Company · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 63686

Government record, cited

NSN 4820-01-276-3291 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-276-3291. Manufacturer of record part number: A-9907-M-166 6IN SR.

Also searched as 4820-01-276-3291 · 4820012763291 · NIIN 012763291 · 01-276-3291 · FSC 4820 Valves, Nonpowered · CAGE 63686 · A-9907-M-166 6IN SR · A-9907-M-166 6IN · A-9907-M-166 6IN SEAT RING

Nearby stock numbers ← 4820-01-276-3290 Seat, Valve · 4820-01-276-3319 Disk, Valve →

4820-01-276-3291 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
1 manufacturer part number on file
Manufacturer of record: The Walworth Company

Identification

NSN: 4820-01-276-3291
NIIN: 012763291
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: A-9907-M-166 6IN SR
Manufacturer: The Walworth Company

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-276-3291, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is The Walworth Company. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.

Catalog Facts

Item Name	Seat,valve
FSC / FSG	4820 — Valves, Nonpowered (FSG 48)
Manufacturers	The Walworth Company (CAGE 63686)

Technical Specifications

Parameter	Value
NSN	4820-01-276-3291
Primary Part Number	A-9907-M-166 6IN SR
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	The Walworth Company
Status	ACTIVE

Lifecycle & Compliance

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

Cross-Reference Index

Part Number	Manufacturer
A-9907-M-166 6IN SR PRIMARY	The Walworth Company (USA)

Reference documents

Reference	Meaning
A-9907-M-166 6IN	5/9 Secondary reference The Walworth Company
A-9907-M-166 6IN SEAT RING	5/9 Secondary reference The Walworth Company

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 4820-01-276-3291?

NSN 4820-01-276-3291 is a Seat,valve, manufactured by The Walworth Company, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-276-3291?

NSN 4820-01-276-3291 has 1 manufacturer part number on file: A-9907-M-166 6IN SR (The Walworth Company).

Is NSN 4820-01-276-3291 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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