The Valve,safety Relief, cataloged under National Stock Number 4820-01-145-7672, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydro-Stack Mfg Corp Sub of the Oilgear Co. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-145-7672 |
| Primary Part Number | HSF-1601-TR |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydro-Stack Mfg Corp Sub of the Oilgear Co |
| Status | ACTIVE |
| Flow Control Device | PISTON |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS |
| Connection Type | THREADED CARTRIDGE ALL ENDS |
| Style Designator | SCREW-IN CARTRIDGE |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.625 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Thread Class | 2A ALL ENDS A |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | STEEL BODY |
| Thread Series Designator | UN ALL ENDS |
| 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 |
|---|---|
| HSF-1601-TR PRIMARY | Hydro-Stack Mfg Corp Sub of the Oilgear Co (USA) |
| L400120HS02 | Hydro-Stack Mfg Corp Sub of the Oilgear Co (USA) |
| Reference | Meaning |
|---|---|
| HSF-1600-TR | C/1 Advisory reference — outside the item-of-supply concept Hydro-Stack Mfg Corp Sub of the Oilgear Co |
NSN 4820-01-145-7672 is a Valve,safety Relief, manufactured by Hydro-Stack Mfg Corp Sub of the Oilgear Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-145-7672 has 2 manufacturer part numbers on file: HSF-1601-TR (Hydro-Stack Mfg Corp Sub of the Oilgear Co), L400120HS02 (Hydro-Stack Mfg Corp Sub of the Oilgear Co).
Key specifications for HSF-1601-TR: Flow Control Device: PISTON; Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS; Connection Type: THREADED CARTRIDGE ALL ENDS; Style Designator: SCREW-IN CARTRIDGE. 12 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.