The Seat,valve, cataloged under National Stock Number 4820-00-357-3605, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Clayton Manufacturing Company. Government technical data includes 6 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. 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 | 4820-00-357-3605 |
| Primary Part Number | K1121 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Clayton Manufacturing Company |
| Status | ACTIVE |
| Body Outside Diameter | 0.763 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 0.497 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Seat Angle in Deg | 30.000 NOMINAL |
| 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 |
| Part Number | Manufacturer |
|---|---|
| K1121 PRIMARY | Clayton Manufacturing Company (USA) |
NSN 4820-00-357-3605 is a Seat,valve, manufactured by Clayton Manufacturing Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-357-3605 has 1 manufacturer part number on file: K1121 (Clayton Manufacturing Company).
2 possible matches (shared part number, not a government interchangeability claim): 5961-00-858-6884, 5920-01-573-4469. Verify interchangeability with system specifications before substitution.
Key specifications for K1121: Overall Height: 0.312 INCHES NOMINAL IN; Body Outside Diameter: 0.763 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 0.497 INCHES NOMINAL IN. 6 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.