The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-545-4557, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-545-4557 |
| Primary Part Number | 512-6406356-AY99-MOD |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Material | STEEL CORROSION RESISTING BODY |
| Adjustable Pressure Range | 10.3 TO 10.7 CAMERA MOUNT |
| 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 |
|---|---|
| 512-6406356-AY99-MOD PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| DF331067-AY99M | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-545-4557 is a Valve,relief,pressure and Temper, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-545-4557 has 1 manufacturer part number on file: 512-6406356-AY99-MOD (Naval Sea Systems Command).
Key specifications for 512-6406356-AY99-MOD: End Item Identification: VALVE RELF 4.50NPS 10.25T10.75PSI FLGE CRES; Material: STEEL CORROSION RESISTING BODY; Adjustable Pressure Range: 10.3 TO 10.7 CAMERA MOUNT. 2 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.