The Piston,internal Combustion Engin, cataloged under National Stock Number 2805-00-770-4058, 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 Brinkley Technology Group Llc Dba Hercules Manufacturing. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-770-4058 |
| Primary Part Number | 32122AS020 |
| Item Name | Piston,internal Combustion Engin |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Brinkley Technology Group Llc Dba Hercules Manufacturing |
| Status | ACTIVE |
| Carbon Groove | NOT INCLUDED |
| Ring Groove Width | 0.1250 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Surface Finish | FINISHED |
| Diameter | 5.188 INCHES NOMINAL IN |
| Ring Groove Diameter | 6.381 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Oil Groove | INCLUDED |
| Ring Groove Quantity | 4 |
| Oversize | 0.020 INCHES NOMINAL IN |
| Finished Size Designation | OVERSIZE |
| Ring | NOT INCLUDED |
| Material | ALUMINUM ALLOY |
| 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 |
|---|---|
| 32122AS020 PRIMARY | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| 7704058 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 32122AS020 | 5/9 Secondary reference Hercules Engine Co Inc |
| 394869 | 5/9 Secondary reference White Motor Corp |
NSN 2805-00-770-4058 is a Piston,internal Combustion Engin, manufactured by Brinkley Technology Group Llc Dba Hercules Manufacturing, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-770-4058 has 2 manufacturer part numbers on file: 32122AS020 (Brinkley Technology Group Llc Dba Hercules Manufacturing), 7704058 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 32122AS020: Overall Height: 6.500 INCHES NOMINAL IN; Carbon Groove: NOT INCLUDED; Ring Groove Width: 0.1250 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN; Surface Finish: FINISHED. 11 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.