The Piston,internal Combustion Engin, cataloged under National Stock Number 2805-00-757-4107, 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 Federal-Mogul Corp Government Sales Dept. Government technical data includes 27 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-757-4107 |
| Primary Part Number | 423P |
| Item Name | Piston,internal Combustion Engin |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Federal-Mogul Corp Government Sales Dept |
| Status | ACTIVE |
| Carbon Groove | NOT INCLUDED |
| Ring Groove Width | 0.1880 INCHES MINIMUM AND 0.1890 INCHES MAXIMUM THIRD RING IN |
| Ring Groove Width | 0.0790 INCHES MINIMUM AND 0.0800 INCHES MAXIMUM FIRST RING IN |
| Ring Groove Width | 0.0790 INCHES MINIMUM AND 0.0800 INCHES MAXIMUM SECOND RING IN |
| Distance Between Pin Bosses | 1.140 INCHES NOMINAL IN |
| Retaining Ring Groove | NOT INCLUDED |
| Surface Finish | FINISHED |
| Oil Passage Type | HOLE LOCATION NOT OTHERWISE SPECIFIED |
| Diameter | 4.000 INCHES NOMINAL IN |
| Ring Groove Diameter | 3.456 INCHES MINIMUM AND 3.556 INCHES MAXIMUM FIRST RING IN |
| Ring Groove Diameter | 3.456 INCHES MINIMUM AND 3.556 INCHES MAXIMUM SECOND RING IN |
| Ring Groove Diameter | 3.582 INCHES MINIMUM AND 3.592 INCHES MAXIMUM THIRD RING IN |
| Distance From Pin Hole Center to Extreme Top | 1.537 INCHES MINIMUM AND 1.542 INCHES MAXIMUM IN |
| Pin | INCLUDED |
| Pin Type for Which Designed | FLOATING |
| Oil Groove | INCLUDED |
| Head Style | CONCAVE |
| Ring Groove Quantity | 3 |
| Skirt Bottom Cutaway Feature | INCLUDED |
| Finished Size Designation | STANDARD |
| Ring | NOT INCLUDED |
| Surface Treatment | TIN |
| Pinhole Diameter | 0.9270 INCHES NOMINAL IN |
| Pin Hole Bushing | NOT INCLUDED |
| Material | ALUMINUM ALLOY |
| Skirt Type | SOLID |
| Cut Depth | 0.970 INCHES NOMINAL 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 |
|---|---|
| 423P PRIMARY | Federal-Mogul Corp Government Sales Dept (USA) |
| 3991488 | General Motors Llc Dba General Motors Llc (USA) |
| 423P | Hastings Manufacturing Co Div Hastings Manufacturing Company (USA) |
| Reference | Meaning |
|---|---|
| L2369F | 3/2 Design control — primary reference U.S. Government activity |
| 3991488 | C/1 Advisory reference — outside the item-of-supply concept Military Vehicles Opn General Motors Truck and Bus Group Ms 2603-02 |
| 3991488 | 5/9 Secondary reference General Motors Corp Chevrolet Motor Div Special Products Dept |
NSN 2805-00-757-4107 is a Piston,internal Combustion Engin, manufactured by Federal-Mogul Corp Government Sales Dept, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-757-4107 has 3 manufacturer part numbers on file: 423P (Federal-Mogul Corp Government Sales Dept), 3991488 (General Motors Llc Dba General Motors Llc), 423P (Hastings Manufacturing Co Div Hastings Manufacturing Company).
Key specifications for 423P: Overall Height: 3.190 INCHES NOMINAL IN; Carbon Groove: NOT INCLUDED; Ring Groove Width: 0.1880 INCHES MINIMUM AND 0.1890 INCHES MAXIMUM THIRD RING IN; Ring Groove Width: 0.0790 INCHES MINIMUM AND 0.0800 INCHES MAXIMUM FIRST RING IN. 27 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.