The Valve,safety Relief, cataloged under National Stock Number 4820-01-550-7785, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-550-7785 |
| Primary Part Number | 6E-4402 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Thread Pitch in Millimeters | 1.0 ALL ENDS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.00 MILLIMETERS ALL ENDS MM |
| Thread Series Designator | ISO M ALL ENDS |
| 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 |
|---|---|
| 6E-4402 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 6E-4402 | 5/9 Secondary reference Caterpillar of Australia Pty Ltd |
NSN 4820-01-550-7785 is a Valve,safety Relief, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-550-7785 has 1 manufacturer part number on file: 6E-4402 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 6E-4402: Flow Control Device: POPPET; Thread Pitch in Millimeters: 1.0 ALL ENDS; Thread Direction: RIGHT-HAND ALL ENDS; Nominal Thread Size: 1.00 MILLIMETERS ALL ENDS MM. 5 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.