PartsTable TECHNICAL DATA SHEET

NSN 4820-01-021-8957Government record, cited

Valve, Assembly Air4820-01-021-8957

NSN 4820-01-021-8957 · NIIN 010218957 · Part number 7D9949

Caterpillar Inc Div Caterpillar Defense · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 11083

Government record, cited

NSN 4820-01-021-8957 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-021-8957. Manufacturer of record part number: 7D9949.

Also searched as 4820-01-021-8957 · 4820010218957 · NIIN 010218957 · 01-021-8957 · FSC 4820 Valves, Nonpowered · CAGE 11083 · 7D9949 · 284352

Nearby stock numbers ← 4820-01-021-8887 · 4820-01-021-8977 Valve, Assembly →

4820-01-021-8957 — Valves, Nonpowered

Features

Valve,assembly Air — FSC 4820
General Characteristics Item Description: BRASS; 0.795 IN. H; ONE END HEXAGON IN SHAPE IN
1 manufacturer part number on file
Manufacturer of record: Caterpillar Inc Div Caterpillar Defense

Identification

NSN: 4820-01-021-8957
NIIN: 010218957
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 7D9949
Manufacturer: Caterpillar Inc Div Caterpillar Defense

General Description

The Valve,assembly Air, cataloged under National Stock Number 4820-01-021-8957, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-021-8957
Primary Part Number	7D9949
Item Name	Valve,assembly Air
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Caterpillar Inc Div Caterpillar Defense
Status	ACTIVE
General Characteristics Item Description	BRASS; 0.795 IN. H; ONE END HEXAGON IN SHAPE IN

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
7D9949 PRIMARY	Caterpillar Inc Div Caterpillar Defense (USA)

Reference documents

Reference	Meaning
284352	3/9 Design control — primary reference Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems

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 4820-01-021-8957?

NSN 4820-01-021-8957 is a Valve,assembly Air, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-021-8957?

NSN 4820-01-021-8957 has 1 manufacturer part number on file: 7D9949 (Caterpillar Inc Div Caterpillar Defense).

What are the specifications of 7D9949?

Key specifications for 7D9949: General Characteristics Item Description: BRASS; 0.795 IN. H; ONE END HEXAGON IN SHAPE IN. 1 specification is documented in the U.S. Government catalog.

Is NSN 4820-01-021-8957 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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