The Valve,safety Relief, cataloged under National Stock Number 4820-01-157-7912, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Pump Division. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-157-7912 |
| Primary Part Number | 509-00003-0 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Pump Division |
| Status | ACTIVE |
| Flow Control Device | PLUG |
| Connection Style | FLARED (TUBE) FIRST END |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Style Designator | SCREW-IN CARTRIDGE |
| Material | PLASTIC BODY |
| Valve Operation Method | HYDRAULIC |
| 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 |
|---|---|
| 509-00003-0 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Pump Division (USA) |
| Reference | Meaning |
|---|---|
| 6671002 | C/1 Advisory reference — outside the item-of-supply concept Arvinmeritor Inc |
| 509-00003 | 5/9 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Pump Division |
NSN 4820-01-157-7912 is a Valve,safety Relief, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Pump Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-157-7912 has 1 manufacturer part number on file: 509-00003-0 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Pump Division).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-354-7618. Verify interchangeability with system specifications before substitution.
Key specifications for 509-00003-0: Flow Control Device: PLUG; Connection Style: FLARED (TUBE) FIRST END; Connection Type: THREADED EXTERNAL TUBE FIRST END; Style Designator: SCREW-IN CARTRIDGE. 6 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.