The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-386-9741, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-386-9741 |
| Primary Part Number | 6406356 AY99 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Material | STEEL CORROSION RESISTING BODY |
| 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 |
|---|---|
| 6406356 AY99 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| 6406356 AY99 PRIMARY | Naval Sea Systems Command (USA) |
| 211045497 | Naval Sea Systems Command (USA) |
| 512-6406356-AY99 PRIMARY | Naval Sea Systems Command (USA) |
NSN 4820-01-386-9741 is a Valve,relief,pressure and Temper, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-386-9741 has 4 manufacturer part numbers on file: 6406356 AY99 (Derbyshire Machine & Tool Co), 6406356 AY99 (Naval Sea Systems Command), 211045497 (Naval Sea Systems Command), 512-6406356-AY99 (Naval Sea Systems Command).
Key specifications for 6406356 AY99: Material: STEEL CORROSION RESISTING BODY. 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.