NSN 4820-01-505-3121 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-505-3121. Manufacturer of record part number: BXMKK03MJJ.
The Valve,safety Relief, cataloged under National Stock Number 4820-01-505-3121, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dante Valve Company. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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
Valve,safety Relief
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Manufacturers
Dante Valve Company (CAGE 5P967)
Technical Specifications
Parameter
Value
NSN
4820-01-505-3121
Primary Part Number
BXMKK03MJJ
Item Name
Valve,safety Relief
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Dante Valve Company
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 Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-521-1651BAMGG03MKMPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Dante Valve Company
4820-01-521-4350BAMGG04MJJPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Dante Valve Company
4820-01-597-8729BAMGG07MJJPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Dante Valve Company
4820-01-655-6356BAMGG05MJJPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Dante Valve Company
NSN 4820-01-505-3121 is a Valve,safety Relief, manufactured by Dante Valve Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-505-3121?
NSN 4820-01-505-3121 has 1 manufacturer part number on file: BXMKK03MJJ (Dante Valve Company).
What NSN replaces 4820-01-505-3121?
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-521-1651, 4820-01-521-4350, 4820-01-597-8729. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-505-3121 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.