The Seat,valve, cataloged under National Stock Number 4820-01-057-6129, 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-057-6129 |
| Primary Part Number | 2050965PC31 2IN |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material | STEEL CORROSION RESISTING SEAT |
| 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 |
|---|---|
| 2050965PC31 2IN | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2640-405X1PC31 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 2050947REVRPC31 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 2640-405X1PC31 2IN | 5/2 Secondary reference U.S. Government activity |
| 2640-405X3PC31 | 3/2 Design control — primary reference U.S. Government activity |
| 2640-402X3PC31 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4820-01-057-6129 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-057-6129 has 1 manufacturer part number on file: 2050965PC31 2IN (Naval Sea Systems Command).
Key specifications for 2050965PC31 2IN: Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE SEAT; Special Features: FOR 2.000 IN. BALL VALVE IN; Material: STEEL CORROSION RESISTING SEAT. 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.