The Piston Assembly,tor, cataloged under National Stock Number 4810-00-977-2854, is classified within Federal Supply Class 4810 (Valves, Powered) of the Valves group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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: Cancelled.
| Item Name | Piston Assembly,tor |
| FSC / FSG | 4810 — Valves, Powered (FSG 48) |
| Manufacturers | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (CAGE 10001); Northrop Grumman Systems Corporation Dba Aerospace Systems Div Aeronautics Systems (CAGE 77646) |
| Parameter | Value |
|---|---|
| NSN | 4810-00-977-2854 |
| Primary Part Number | 1557021 |
| Item Name | Piston Assembly,tor |
| FSC / FSG | 4810 / 48 — Valves, Powered |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | CANCELLED |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL C — Remove/Demil Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 1557021 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| 1557021 | Northrop Grumman Systems Corporation Dba Aerospace Systems Div Aeronautics Systems (USA) |
| Reference | Meaning |
|---|---|
| BUWEPSDWG1557021 | 5/9 Secondary reference Sturdy Products Mfg Co |
NSN 4810-00-977-2854 is a Piston Assembly,tor, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 4810, Valves, Powered. Status: cancelled.
NSN 4810-00-977-2854 has 2 manufacturer part numbers on file: 1557021 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 1557021 (Northrop Grumman Systems Corporation Dba Aerospace Systems Div Aeronautics Systems).
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4810-00-977-2854 has DEMIL Code C. Demilitarization may be required before disposal or transfer to non-military entities.
NSN 4810-00-977-2854 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.