The Valve,safety Relief, cataloged under National Stock Number 4820-00-021-2391, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Haldex Brake Products Corporation. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-021-2391 |
| Primary Part Number | N30073FB |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Haldex Brake Products Corporation |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END IN |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST END |
| Center to Center Distance | 1.880 INCHES IN |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.500 INCHES FIRST END IN |
| Second Connection Face to Centerline Distance | 1.460 INCHES IN |
| Mounting Facility | THREADED FASTENER |
| First Connection Face to Centerline Distance | 1.460 INCHES IN |
| Thread Quantity Per Inch | 14 FIRST END |
| Material | STEEL BODY |
| Thread Series Designator | NPTF FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 11588684 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| N30073FB PRIMARY | Haldex Brake Products Corporation (USA) |
| Reference | Meaning |
|---|---|
| N-30073-A | 5/9 Secondary reference Haldex Brake Products Corporation |
| N-300-FB | 5/9 Secondary reference Haldex Brake Products Corporation |
NSN 4820-00-021-2391 is a Valve,safety Relief, manufactured by Haldex Brake Products Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-021-2391 has 2 manufacturer part numbers on file: 11588684 (U S Army Tank Automotive Command Amsta-Im-Mm), N30073FB (Haldex Brake Products Corporation).
Key specifications for N30073FB: Nominal Pipe Size Accommodated: 0.500 INCHES FIRST END IN; Connection Style: PLAIN,OPTIONAL END(PIPE) FIRST END; Center to Center Distance: 1.880 INCHES IN; Thread Direction: RIGHT-HAND FIRST END. 11 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.