PartsTable TECHNICAL DATA SHEET

NSN 4820-01-231-9004Government record, cited

Seat, Valve4820-01-231-9004

NSN 4820-01-231-9004 · NIIN 012319004 · Part number 51177-J

Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 76364

Government record, cited

NSN 4820-01-231-9004 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-231-9004. Manufacturer of record part number: 51177-J.

Also searched as 4820-01-231-9004 · 4820012319004 · NIIN 012319004 · 01-231-9004 · FSC 4820 Valves, Nonpowered · CAGE 76364 · 51177-J · 51188-J · 803-4384536-84X-13

Nearby stock numbers ← 4820-01-231-9003 · 4820-01-231-9064 →

4820-01-231-9004 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
Thread Length: 0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
Style Designator: PLAIN THREADED
Material Document and Classification: ASTM-B-164 ASSN STD SINGLE MATERIAL RESPONSE OR QQ-N-288 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Body Inside Diameter: 2.0489 INCHES NOMINAL IN
Nominal Thread Size: 2.625 INCHES SINGLE THREADED PORTION IN
Thread Class: 3A SINGLE THREADED PORTION A
Thread Quantity Per Inch: 18 SINGLE THREADED PORTION

Identification

NSN: 4820-01-231-9004
NIIN: 012319004
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 51177-J
Manufacturer: Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-231-9004, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.

Technical Specifications

Parameter	Value
NSN	4820-01-231-9004
Primary Part Number	51177-J
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
Status	ACTIVE
Thread Length	0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
Style Designator	PLAIN THREADED
Material Document and Classification	ASTM-B-164 ASSN STD SINGLE MATERIAL RESPONSE OR QQ-N-288 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Body Inside Diameter	2.0489 INCHES NOMINAL IN
Nominal Thread Size	2.625 INCHES SINGLE THREADED PORTION IN
Thread Class	3A SINGLE THREADED PORTION A
Thread Quantity Per Inch	18 SINGLE THREADED PORTION
Material	NICKEL ALLOY OVERALL
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

Part Number	Manufacturer
51177-J	Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)

Reference documents

Reference	Meaning
51188-J	5/9 Secondary reference Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
803-4384536-84X-13	3/2 Design control — primary reference 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 4820-01-231-9004?

NSN 4820-01-231-9004 is a Seat,valve, manufactured by Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-231-9004?

NSN 4820-01-231-9004 has 1 manufacturer part number on file: 51177-J (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc).

What are the specifications of 51177-J?

Key specifications for 51177-J: Overall Height: 0.500 INCHES NOMINAL IN; Thread Length: 0.375 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: PLAIN THREADED; Material Document and Classification: ASTM-B-164 ASSN STD SINGLE MATERIAL RESPONSE OR QQ-N-288 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 10 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-231-9004 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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