The Piston,internal Combustion Engin, cataloged under National Stock Number 2815-00-434-6594, is classified within Federal Supply Class 2815 (Diesel Engines and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Tecmotiv (usa), Inc.. Government technical data includes 28 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2815-00-434-6594 |
| Primary Part Number | 11683943-4 |
| Item Name | Piston,internal Combustion Engin |
| FSC / FSG | 2815 / 28 — Diesel Engines and Components |
| Manufacturer | Tecmotiv (usa), Inc. |
| Status | ACTIVE |
| Carbon Groove | NOT INCLUDED |
| Ring Groove Width | 0.1880 INCHES MINIMUM AND 0.1890 INCHES MAXIMUM FOURTH RING IN |
| Ring Groove Width | 0.0980 INCHES MINIMUM AND 0.0990 INCHES MAXIMUM THIRD RING IN |
| Ring Groove Width | 0.0990 INCHES MINIMUM AND 0.1000 INCHES MAXIMUM SECOND RING IN |
| Ring Groove Width | 0.0995 INCHES MINIMUM AND 0.1005 INCHES MAXIMUM FIRST RING IN |
| Retaining Ring Groove | NOT INCLUDED |
| Surface Finish | FINISHED |
| Diameter | 5.725 INCHES MINIMUM AND 5.733 INCHES MAXIMUM IN |
| Ring Groove Diameter | 5.209 INCHES MINIMUM AND 5.219 INCHES MAXIMUM FOURTH RING IN |
| Ring Groove Diameter | 5.232 INCHES MINIMUM AND 5.277 INCHES MAXIMUM FIRST RING IN |
| Ring Groove Diameter | 5.250 INCHES MINIMUM AND 5.260 INCHES MAXIMUM SECOND RING IN |
| Ring Groove Diameter | 5.250 INCHES MINIMUM AND 5.260 INCHES MAXIMUM THIRD RING IN |
| Distance From Pin Hole Center to Extreme Top | 4.750 INCHES NOMINAL IN |
| Pin | NOT INCLUDED |
| Pin Type for Which Designed | FLOATING |
| Oil Groove | NOT INCLUDED |
| Head Style | DOME |
| Ring Groove Quantity | 4 |
| Oversize | 0.040 INCHES NOMINAL IN |
| Skirt Bottom Cutaway Feature | INCLUDED |
| Finished Size Designation | OVERSIZE |
| Ring | NOT INCLUDED |
| Pinhole Diameter | 2.1268 INCHES MINIMUM AND 2.1270 INCHES MAXIMUM IN |
| Pin Hole Bushing | NOT INCLUDED |
| Material | STEEL |
| Skirt Type | SEMISPLIT |
| Groove Taper Angle | 7 DEGREE 20 MINUTES PLUS 10 MINUTES |
| Cut Depth | 5.120 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 |
|---|---|
| 11683943-4 PRIMARY | Tecmotiv (usa), Inc. (USA) |
| 11683943-4 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 655216-4 | 5/9 Secondary reference Renk America Llc Div Renk America |
| 2815004346594 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 11683943-4 | 5/9 Secondary reference Mactek Industries Corp |
| 11683943 | D/9 Drawing number reference only U S Army Tank Automotive Command Amsta-Im-Mm |
| 11683943-4 | 5/9 Secondary reference Renk America Llc Div Renk America |
| 11683943-4 | 5/9 Secondary reference Minowitz Manufacturing Co. |
| 11683943-4 | 5/9 Secondary reference Brighton Cromwell Llc |
NSN 2815-00-434-6594 is a Piston,internal Combustion Engin, manufactured by Tecmotiv (usa), Inc., classified under FSC 2815, Diesel Engines and Components. Status: active.
NSN 2815-00-434-6594 has 2 manufacturer part numbers on file: 11683943-4 (Tecmotiv (usa), Inc.), 11683943-4 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 11683943-4: Overall Height: 6.870 INCHES NOMINAL IN; Carbon Groove: NOT INCLUDED; Ring Groove Width: 0.1880 INCHES MINIMUM AND 0.1890 INCHES MAXIMUM FOURTH RING IN; Ring Groove Width: 0.0980 INCHES MINIMUM AND 0.0990 INCHES MAXIMUM THIRD RING IN. 28 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.