The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-182-0191, 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 Valve Division. Government technical data includes 11 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-182-0191 |
| Primary Part Number | 6581-3/4S2-2 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Temp Rating | -65.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF |
| Body Style | STRAIGHT THRU |
| Material Document and Classification | AISI 303S ASSN STD SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | FED STD 66 FED STD SINGLE MATERIAL RESPONSE OR AISI 12L14 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | FED STD 66 FED STD SINGLE MATERIAL RESPONSE OR AISI 4140 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | FED STD 66 FED STD SINGLE MATERIAL RESPONSE OR AISI 4140 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material | STEEL COMP 12L14 BODY |
| Material | STEEL COMP 303SE STEM |
| Material | STEEL COMP 4140 FLOW CONTROL DEVICE |
| Material | STEEL COMP 4140 SEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6581-3/4S2-2 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division (USA) |
| Reference | Meaning |
|---|---|
| 6581-3/4S2-2 | 5/9 Secondary reference U.S. Government activity |
| 65856-0102-1000 | 5/9 Secondary reference U.S. Government activity |
| 6543D057-1 | 7/2 Vendor item drawing reference Indal Technologies Inc |
NSN 4820-01-182-0191 is a Valve,relief,pressure and Temper, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-182-0191 has 1 manufacturer part number on file: 6581-3/4S2-2 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division).
Key specifications for 6581-3/4S2-2: Flow Control Device: POPPET; Temp Rating: -65.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF; Body Style: STRAIGHT THRU; Material Document and Classification: AISI 303S ASSN STD SINGLE MATERIAL RESPONSE STEM. 11 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.
NSN 4820-01-182-0191 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.