The Valve,safety Relief, cataloged under National Stock Number 4820-00-672-6581, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Danfoss Fluid Power Inc Easley Opn. 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-672-6581 |
| Primary Part Number | 1641-8T6T |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Danfoss Fluid Power Inc Easley Opn |
| Status | ACTIVE |
| Connection Style | GASKET SEAL(BOSS) FIRST END |
| Connection Type | THREADED INTERNAL BOSS FIRST END |
| Connection Type | THREADED EXTERNAL BOSS SECOND END |
| Style Designator | ANGLE |
| Adjustable Pressure Range | +900.0 TO 950.0 POUNDS PER SQUARE INCH LBS |
| Features Provided | PRESSURE TIGHT OUTLET SIDE |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Thread Class | 3B FIRST END |
| Thread Quantity Per Inch | 18 FIRST END |
| Thread Series Designator | UNF FIRST END |
| 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 |
|---|---|
| 1641-8T6T | Danfoss Fluid Power Inc Easley Opn (USA) |
| N1641-8T6T | Danfoss Fluid Power Inc Easley Opn (USA) |
| Reference | Meaning |
|---|---|
| 56B23438-2 | 5/9 Secondary reference U.S. Government activity |
| 56B23438-2 | 5/9 Secondary reference U.S. Government activity |
| 56B23438-3 | 3/9 Design control — primary reference U.S. Government activity |
| 56B23438-2 | 5/9 Secondary reference Eglin Air Force Base |
NSN 4820-00-672-6581 is a Valve,safety Relief, manufactured by Danfoss Fluid Power Inc Easley Opn, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-672-6581 has 2 manufacturer part numbers on file: 1641-8T6T (Danfoss Fluid Power Inc Easley Opn), N1641-8T6T (Danfoss Fluid Power Inc Easley Opn).
Key specifications for 1641-8T6T: Connection Style: GASKET SEAL(BOSS) FIRST END; Connection Type: THREADED INTERNAL BOSS FIRST END; Connection Type: THREADED EXTERNAL BOSS SECOND END; Style Designator: ANGLE. 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.