The Piston,internal Combustion Engin, cataloged under National Stock Number 2805-00-659-7760, 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 U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 29 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-659-7760 |
| Primary Part Number | 7739556 |
| Item Name | Piston,internal Combustion Engin |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| FSC Application Data | ENGINE,GASOLINE,VEHICULAR |
| Carbon Groove | NOT INCLUDED |
| Ring Groove Width | 0.0950 INCHES MINIMUM THIRD RING IN |
| Ring Groove Width | 0.0955 INCHES MINIMUM FIRST RING IN |
| Ring Groove Width | 0.0960 INCHES MAXIMUM FOURTH RING IN |
| Ring Groove Width | 0.0965 INCHES MAXIMUM SECOND RING IN |
| Ring Groove Width | 0.1880 INCHES MINIMUM FIFTH RING IN |
| Ring Groove Width | 0.1890 INCHES MAXIMUM SIXTH RING IN |
| Distance Between Pin Bosses | 1.312 INCHES NOMINAL IN |
| Retaining Ring Groove | INCLUDED |
| Surface Finish | FINISHED |
| Supplementary Features | OIL PASSAGE HOLE |
| Material Document and Classification | QQ-A-596, ALLOY NO. A132, TEMPER T551 FED SPEC SINGLE MATERIAL RESPONSE |
| Diameter | 2.976 INCHES MINIMUM AND 2.980 INCHES MAXIMUM IN |
| Ring Groove Diameter | 2.634 INCHES MINIMUM FIFTH RING IN |
| Ring Groove Diameter | 2.644 INCHES MAXIMUM SIXTH RING IN |
| Ring Groove Diameter | 2.674 INCHES MINIMUM FIRST RING IN |
| Ring Groove Diameter | 2.674 INCHES MINIMUM THIRD RING IN |
| Ring Groove Diameter | 2.684 INCHES MAXIMUM FOURTH RING IN |
| Ring Groove Diameter | 2.684 INCHES MAXIMUM SECOND RING IN |
| Distance From Pin Hole Center to Extreme Top | 1.495 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN |
| Pin | INCLUDED |
| Pin Type for Which Designed | FLOATING |
| Oil Groove | NOT INCLUDED |
| Head Style | FLAT |
| Ring Groove Quantity | 3 |
| Skirt Bottom Cutaway Feature | INCLUDED |
| Finished Size Designation | STANDARD |
| Ring | NOT INCLUDED |
| 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 |
|---|---|
| 7739556 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 2805-00-659-7760 is a Piston,internal Combustion Engin, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-659-7760 has 1 manufacturer part number on file: 7739556 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7739556: Overall Height: 2.995 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN; FSC Application Data: ENGINE,GASOLINE,VEHICULAR; Carbon Groove: NOT INCLUDED; Ring Groove Width: 0.0950 INCHES MINIMUM THIRD RING IN. 29 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.