The Seat,valve, cataloged under National Stock Number 4820-01-643-6899, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Seat,valve |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Naval Inventory Control Point Mechanicsburg (CAGE 03950) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-643-6899 |
| Primary Part Number | H547-0001-2177934-4-18D4 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| H547-0001-2177934-4-18D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| 803-2177934-X4XX-18D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| 7383858-2177934-4-18D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 7383858-2177934-4-18 | 5/1 Secondary reference Naval Sea Systems Command |
| H547-0001-2177934-4-18 | 5/1 Secondary reference U.S. Government activity |
| 803-2177934-X4XX-18 | 3/1 Design control — primary reference U.S. Government activity |
NSN 4820-01-643-6899 is a Seat,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-643-6899 has 3 manufacturer part numbers on file: H547-0001-2177934-4-18D4 (Naval Inventory Control Point Mechanicsburg), 803-2177934-X4XX-18D4 (Naval Inventory Control Point Mechanicsburg), 7383858-2177934-4-18D4 (Naval Inventory Control Point Mechanicsburg).
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.