The Seat,valve, cataloged under National Stock Number 4820-01-071-7387, 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 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-071-7387 |
| Primary Part Number | 845-4558777ITEM11 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Body Outside Diameter | 3.875 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Material Document and Classification | MIL-C-15726,CMPSN 70-30 SOFT MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 3.500 INCHES MINIMUM AND 3.502 INCHES MAXIMUM IN |
| Material | COPPER ALLOY OVERALL |
| Seat Angle in Deg | 45.000 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 |
|---|---|
| 845-4558777ITEM11 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 264080203-0017 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-071-7387 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-071-7387 has 1 manufacturer part number on file: 845-4558777ITEM11 (Naval Sea Systems Command).
Key specifications for 845-4558777ITEM11: Overall Height: 0.359 INCHES NOMINAL IN; Body Outside Diameter: 3.875 INCHES NOMINAL IN; Style Designator: PLAIN; Material Document and Classification: MIL-C-15726,CMPSN 70-30 SOFT MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 7 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.