The Valve,safety Relief, cataloged under National Stock Number 4820-01-141-9649, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ausco Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-141-9649 |
| Primary Part Number | H964 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ausco Inc |
| Status | ACTIVE |
| Connection Style | GROOVED (DROP-IN CARTRIDGE) ALL ENDS |
| Connection Type | UNTHREADED CARTRIDGE ALL ENDS |
| Style Designator | DROP-IN CARTRIDGE |
| Operating Pressure | 350.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Disk Loading Method | SPRING |
| Media for Which Designed | OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE |
| Opening Pressure Setting | 300.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 12.0 GALLONS PER MINUTE |
| Valve Operation Method | 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 |
|---|---|
| H964 PRIMARY | Ausco Inc (USA) |
| Reference | Meaning |
|---|---|
| 10124636 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 42312E163 | 5/9 Secondary reference U.S. Government activity |
| 42312-163 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 4820-01-141-9649 is a Valve,safety Relief, manufactured by Ausco Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-141-9649 has 1 manufacturer part number on file: H964 (Ausco Inc).
1 possible match (shared part number, not a government interchangeability claim): 5950-01-166-2735. Verify interchangeability with system specifications before substitution.
Key specifications for H964: Connection Style: GROOVED (DROP-IN CARTRIDGE) ALL ENDS; Connection Type: UNTHREADED CARTRIDGE ALL ENDS; Style Designator: DROP-IN CARTRIDGE; Operating Pressure: 350.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 9 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.