Valve, Safety Relief4820-01-557-4139

NSN 4820-01-557-4139 · NIIN 015574139 · Part number SO-5446

Merrill Technologies Group, Llc Dba Keel Midwest - Gratiot · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 3DTR4

Government record, cited

NSN 4820-01-557-4139 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-557-4139. Manufacturer of record part number: SO-5446.

Also searched as 4820-01-557-4139 · 4820015574139 · NIIN 015574139 · 01-557-4139 · FSC 4820 Valves, Nonpowered · CAGE 3DTR4 · SO-5446

Nearby stock numbers ← 4820-01-557-4101 Valve, Pneumatic Tank · 4820-01-557-4215 Valve, Foot →

4820-01-557-4139 — Valves, Nonpowered

Features

Valve,safety Relief — FSC 4820
1 manufacturer part number on file
Manufacturer of record: Merrill Technologies Group, Llc Dba Keel Midwest - Gratiot

Identification

NSN: 4820-01-557-4139
NIIN: 015574139
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: SO-5446
Manufacturer: Merrill Technologies Group, Llc Dba Keel Midwest - Gratiot

General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-557-4139, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Merrill Technologies Group, Llc Dba Keel Midwest - Gratiot. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares 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	4820-01-557-4139
Primary Part Number	SO-5446
Item Name	Valve,safety Relief
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Merrill Technologies Group, Llc Dba Keel Midwest - Gratiot
Status	ACTIVE

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 1

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

4810-01-574-5345MTM-20100 POSSIBLE MATCH

VALVE ASSEMBLY,MANIFOLD

Possible match (shared part number)Merrill Technologies Group, Llc Dba Keel Midwest - Gratiot

Cross-Reference Index

Part Number	Manufacturer
SO-5446 PRIMARY	Merrill Technologies Group, Llc Dba Keel Midwest - Gratiot (USA)

Related Parts

4810-01-574-5345POSSIBLE MATCH

VALVE ASSEMBLY,MANIFOLD

MTM-20100

Frequently Asked Questions

What is NSN 4820-01-557-4139?

NSN 4820-01-557-4139 is a Valve,safety Relief, manufactured by Merrill Technologies Group, Llc Dba Keel Midwest - Gratiot, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-557-4139?

NSN 4820-01-557-4139 has 1 manufacturer part number on file: SO-5446 (Merrill Technologies Group, Llc Dba Keel Midwest - Gratiot).

What NSN replaces 4820-01-557-4139?

1 possible match (shared part number, not a government interchangeability claim): 4810-01-574-5345. Verify interchangeability with system specifications before substitution.

What are the specifications of SO-5446?

Key specifications for SO-5446: Part Name Assigned by Controlling Agency: DEPRESSURIZAT,VALVE. 0 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-557-4139 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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