The Ring Set,piston, cataloged under National Stock Number 2805-00-351-7780, is classified within Federal Supply Class 2805 (Gasoline Reciprocating Engines, Except Aircraft; and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Hastings Manufacturing Co Div Hastings Manufacturing Company. Government technical data includes 4 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-351-7780 |
| Primary Part Number | 139-020 |
| Item Name | Ring Set,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Hastings Manufacturing Co Div Hastings Manufacturing Company |
| Status | ACTIVE |
| Bore Diameter Oversize | 0.020 INCHES IN |
| Ring Set Component Parts | COMPRESSION RING 4,EXPANDER RING 4,RAIL 4 |
| Piston Accommodation Quantity | 2 |
| Standard Bore Diameter | 4.000 INCHES IN |
| 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 |
|---|---|
| 139-020 PRIMARY | Hastings Manufacturing Co Div Hastings Manufacturing Company (USA) |
| Reference | Meaning |
|---|---|
| C3AZ6148G | 5/9 Secondary reference Ford Motor Company |
| C3AZ6148G | 5/9 Secondary reference U.S. Government activity |
| C3AZ6148G | 5/9 Secondary reference Ford Motor Co Ford Parts and Service Div Government Part Sales |
NSN 2805-00-351-7780 is a Ring Set,piston, manufactured by Hastings Manufacturing Co Div Hastings Manufacturing Company, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-351-7780 has 1 manufacturer part number on file: 139-020 (Hastings Manufacturing Co Div Hastings Manufacturing Company).
1 possible match (shared part number, not a government interchangeability claim): 6695-01-175-2469. Verify interchangeability with system specifications before substitution.
Key specifications for 139-020: Bore Diameter Oversize: 0.020 INCHES IN; Ring Set Component Parts: COMPRESSION RING 4,EXPANDER RING 4,RAIL 4; Piston Accommodation Quantity: 2; Standard Bore Diameter: 4.000 INCHES IN. 4 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.