PartsTable TECHNICAL DATA SHEET

NSN 4820-01-318-9741Government record, cited

Stem, Fluid Valve4820-01-318-9741

NSN 4820-01-318-9741 · NIIN 013189741 · Part number 255721 PIECE 27

Huntington Ingalls Inc Div Newport News Shipbuilding · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 43689

Government record, cited

NSN 4820-01-318-9741 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-318-9741. Manufacturer of record part number: 255721 PIECE 27.

Also searched as 4820-01-318-9741 · 4820013189741 · NIIN 013189741 · 01-318-9741 · FSC 4820 Valves, Nonpowered · CAGE 43689 · 255721 PIECE 27 · 255721

Nearby stock numbers ← 4820-01-318-9722 Valve, Regulating, Fluid Pressure · 4820-01-318-9745 Retainer, Disk, Valve →

4820-01-318-9741 — Valves, Nonpowered

Features

Stem,fluid Valve — FSC 4820
Valve Type for Which Designed: BALL
Largest Outside Diameter: 0.875 INCHES NOMINAL IN
Stem Actuating End Type: THREADED EXTERNALLY
Valve Size for Which Designed: 1.250 INCHES IN
Material: COPPER ALLOY 630
1 manufacturer part number on file
Manufacturer of record: Huntington Ingalls Inc Div Newport News Shipbuilding

Identification

NSN: 4820-01-318-9741
NIIN: 013189741
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 255721 PIECE 27
Manufacturer: Huntington Ingalls Inc Div Newport News Shipbuilding

General Description

The Stem,fluid Valve, cataloged under National Stock Number 4820-01-318-9741, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-318-9741
Primary Part Number	255721 PIECE 27
Item Name	Stem,fluid Valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Huntington Ingalls Inc Div Newport News Shipbuilding
Status	ACTIVE
Valve Type for Which Designed	BALL
Largest Outside Diameter	0.875 INCHES NOMINAL IN
Stem Actuating End Type	THREADED EXTERNALLY
Valve Size for Which Designed	1.250 INCHES IN
Material	COPPER ALLOY 630

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

⇄ Related Items 4

Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.

4820-01-318-9745255721 PIECE 107 POSSIBLE MATCH

RETAINER,DISK,VALVE

Possible match (shared part number)Huntington Ingalls Inc Div Newport News Shipbuilding

4820-01-359-2831255722 PIECE 14 POSSIBLE MATCH

SPRING,REMOTE CONTROL LEVER

Possible match (shared part number)Huntington Ingalls Inc Div Newport News Shipbuilding

4820-01-448-9575255721 PIECE 106 POSSIBLE MATCH

SEAT,VALVE

Possible match (shared part number)Huntington Ingalls Inc Div Newport News Shipbuilding

4330-01-504-612225572-1 POSSIBLE MATCH

PNEUMATIC MUFFLER,EXHAUST-INTAKE

Possible match (shared part number)Hutchinson Aerospace & Industry, Inc. Dba Barry Wright Corp

Cross-Reference Index

Part Number	Manufacturer
255721 PIECE 27 PRIMARY	Huntington Ingalls Inc Div Newport News Shipbuilding (USA)

Reference documents

Reference	Meaning
255721	D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding

Related Parts

4820-01-318-9745POSSIBLE MATCH

RETAINER,DISK,VALVE

255721 PIECE 107

4820-01-359-2831POSSIBLE MATCH

SPRING,REMOTE CONTROL LEVER

255722 PIECE 14

4820-01-448-9575POSSIBLE MATCH

SEAT,VALVE

255721 PIECE 106

4330-01-504-6122POSSIBLE MATCH

PNEUMATIC MUFFLER,EXHAUST-INTAKE

25572-1

Frequently Asked Questions

What is NSN 4820-01-318-9741?

NSN 4820-01-318-9741 is a Stem,fluid Valve, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-318-9741?

NSN 4820-01-318-9741 has 1 manufacturer part number on file: 255721 PIECE 27 (Huntington Ingalls Inc Div Newport News Shipbuilding).

What NSN replaces 4820-01-318-9741?

4 possible matches (shared part number, not a government interchangeability claim): 4820-01-318-9745, 4820-01-359-2831, 4820-01-448-9575. Verify interchangeability with system specifications before substitution.

What are the specifications of 255721 PIECE 27?

Key specifications for 255721 PIECE 27: Valve Type for Which Designed: BALL; Largest Outside Diameter: 0.875 INCHES NOMINAL IN; Stem Actuating End Type: THREADED EXTERNALLY; Overall Length: 4.500 INCHES NOMINAL IN. 5 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-318-9741 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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