The Seat,valve, cataloged under National Stock Number 4820-01-397-5794, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc. Government technical data includes 5 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. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-397-5794 |
| Primary Part Number | M3291-DB |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc |
| Status | ACTIVE |
| Style Designator | PLAIN THREADED |
| Nominal Thread Size | 4.375 INCHES SINGLE THREADED PORTION IN |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Thread Series Designator | UN SINGLE THREADED PORTION |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4820-01-397-5794 is a Seat,valve, manufactured by Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-397-5794 has 2 manufacturer part numbers on file: M3291-DB (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc), M3291 (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc).
2 possible matches (shared part number, not a government interchangeability claim): 6130-01-565-5500, 6630-01-612-7314. Verify interchangeability with system specifications before substitution.
Key specifications for M3291-DB: Overall Height: 0.625 INCHES NOMINAL IN; Style Designator: PLAIN THREADED; Nominal Thread Size: 4.375 INCHES SINGLE THREADED PORTION IN; Thread Quantity Per Inch: 12 SINGLE THREADED PORTION. 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.