PartsTable TECHNICAL DATA SHEET

NSN 4820-01-256-0291Government record, cited

Head, Safety, Pressure Relief4820-01-256-0291

NSN 4820-01-256-0291 · NIIN 012560291

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-256-0291 · 4820012560291 · NIIN 012560291 · 01-256-0291 · FSC 4820 Valves, Nonpowered · MRK-2"-700PSIG/72DEGF-316SST · D3020

Nearby stock numbers ← 4820-01-256-0290 Head, Safety, Pressure Relief · 4820-01-256-0292 Head, Safety, Pressure Relief →

4820-01-256-0291 — Valves, Nonpowered

Features

Head,safety,pressure Relief — FSC 4820

Identification

NSN: 4820-01-256-0291
NIIN: 012560291
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Head,safety,pressure Relief, cataloged under National Stock Number 4820-01-256-0291, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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.

Catalog Facts

Item Name	Head,safety,pressure Relief
FSC / FSG	4820 — Valves, Nonpowered (FSG 48)

Technical Specifications

Parameter	Value
NSN	4820-01-256-0291
Item Name	Head,safety,pressure Relief
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL F — Mutilate — Cut
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	C

⇄ Related Items 4

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

4820-01-256-0292 POSSIBLE MATCH

HEAD,SAFETY,PRESSURE RELIEF

Possible match (shared part number)

4820-01-256-0855 POSSIBLE MATCH

DISK,RUPTURABLE

Possible match (shared part number)

4820-01-256-0856 POSSIBLE MATCH

DISK,RUPTURABLE

Possible match (shared part number)

4820-01-256-0857 POSSIBLE MATCH

DISK,RUPTURABLE

Possible match (shared part number)

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
MRK-2"-700PSIG/72DEGF-316SST	3/1 Design control — primary reference Fike Corporation
D3020	5/1 Secondary reference Fike Corporation

Related Parts

4820-01-256-0292POSSIBLE MATCH

HEAD,SAFETY,PRESSURE RELIEF

4820-01-256-0855POSSIBLE MATCH

DISK,RUPTURABLE

4820-01-256-0856POSSIBLE MATCH

DISK,RUPTURABLE

4820-01-256-0857POSSIBLE MATCH

DISK,RUPTURABLE

Frequently Asked Questions

What is NSN 4820-01-256-0291?

NSN 4820-01-256-0291 is a Head,safety,pressure Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-256-0291?

4 possible matches (shared part number, not a government interchangeability claim): 4820-01-256-0292, 4820-01-256-0855, 4820-01-256-0856. Verify interchangeability with system specifications before substitution.

Is NSN 4820-01-256-0291 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.

What is the DEMIL code for NSN 4820-01-256-0291?

NSN 4820-01-256-0291 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.

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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