The Valve,safety Relief, cataloged under National Stock Number 4820-01-592-1690, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-592-1690 |
| Primary Part Number | 6871K51 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Material | ALUMINUM OVERALL |
| 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 |
|---|---|
| 6871K51 | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 4706K145 | 5/9 Secondary reference Mcmaster-Carr Supply Co |
| 627B-4-3/4 | 3/9 Design control — primary reference Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
NSN 4820-01-592-1690 is a Valve,safety Relief, manufactured by Mcmaster-Carr Supply Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-592-1690 has 1 manufacturer part number on file: 6871K51 (Mcmaster-Carr Supply Co).
Key specifications for 6871K51: Special Features: ADJUSTABLE RELIEF VALVE, ALUMINUM 3/4 INCH NPT FEMALE, 115-250 PSI, SET AT 200 PSI IN; Part Name Assigned by Controlling Agency: ADJUSTABLE RELIEF VALVE; End Item Identification: VARIOUS E/I; Material: ALUMINUM OVERALL. 1 specification is 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.