The Valve,safety Relief, cataloged under National Stock Number 4820-01-283-4773, 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 10 specifications, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-283-4773 |
| Primary Part Number | N1178AA |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Haldex Brake Products Corporation |
| Status | ACTIVE |
| Connection Style | PLAIN (PIPE) FIRST END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | SCREW-IN CARTRIDGE |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 150.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AIR OR AUTOMATIC |
| 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 |
|---|---|
| N1178AA PRIMARY | Haldex Brake Products Corporation (USA) |
| Reference | Meaning |
|---|---|
| KN-31200 | 5/9 Secondary reference Haldex Brake Products Corporation |
| 013595-00A0 | 5/9 Secondary reference Tld Wollard Llc |
| KN-31200 | 5/9 Secondary reference Gleeman Truck Parts |
NSN 4820-01-283-4773 is a Valve,safety Relief, manufactured by Haldex Brake Products Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-283-4773 has 1 manufacturer part number on file: N1178AA (Haldex Brake Products Corporation).
Key specifications for N1178AA: Connection Style: PLAIN (PIPE) FIRST END; Connection Type: THREADED EXTERNAL PIPE FIRST END; Style Designator: SCREW-IN CARTRIDGE; Operating Pressure: 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 10 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.