The Seat,valve, cataloged under National Stock Number 4820-01-054-8977, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-054-8977 |
| Primary Part Number | 845-7285297 PIECE 28 Q3 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | ITEM THAT SUPPORTS A LEVEL 1 OR SUBSAFE CRITICAL SYSTEM THAT HAS UNDERGONE QUALITY ASSURANCE DURING THE ACQUISITION PROCESS |
| 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 |
|---|---|
| 845-7285297 PIECE 28 Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-4687581 ITEM 12Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2642-860-01 ITEM 12Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 2640-801X01 PIECE 28Q3 | 5/9 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 2640-801X01 PIECE 28 | 5/9 Secondary reference U.S. Government activity |
| 845-4687581 ITEM 12 | 5/1 Secondary reference U.S. Government activity |
| 2640-801-01 PIECE 28 | 5/9 Secondary reference U.S. Government activity |
| 2640-801-01 PIECE 28Q3 | 5/9 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 845-7285297 PIECE 28 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 2642-860-01 ITEM 12 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-01-054-8977 is a Seat,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-054-8977 has 3 manufacturer part numbers on file: 845-7285297 PIECE 28 Q3 (Naval Inventory Control Point Mechanicsburg), 845-4687581 ITEM 12Q3 (Naval Inventory Control Point Mechanicsburg), 2642-860-01 ITEM 12Q3 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 845-7285297 PIECE 28 Q3: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: ITEM THAT SUPPORTS A LEVEL 1 OR SUBSAFE CRITICAL SYSTEM THAT HAS UNDERGONE QUALITY ASSURANCE DURING THE ACQUISITION PROCESS. 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.