The Piston,internal Combustion Engin, cataloged under National Stock Number 2815-00-338-7986, is classified within Federal Supply Class 2815 (Diesel Engines and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Fairbanks Morse, Llc. Government technical data includes 27 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2815-00-338-7986 |
| Primary Part Number | CADH5A |
| Item Name | Piston,internal Combustion Engin |
| FSC / FSG | 2815 / 28 — Diesel Engines and Components |
| Manufacturer | Fairbanks Morse, Llc |
| Status | ACTIVE |
| Carbon Groove | NOT INCLUDED |
| Ring Groove Width | 0.2500 INCHES NOMINAL FOURTH RING IN |
| Ring Groove Width | 0.1875 INCHES NOMINAL FIFTH RING IN |
| Ring Groove Width | 0.1875 INCHES NOMINAL SIXTH RING IN |
| Ring Groove Width | 0.2810 INCHES NOMINAL FIRST RING IN |
| Ring Groove Width | 0.2810 INCHES NOMINAL SECOND RING IN |
| Ring Groove Width | 0.2810 INCHES NOMINAL THIRD RING IN |
| Retaining Ring Groove | NOT INCLUDED |
| Surface Finish | FINISHED |
| Oil Passage Type | HOLE SIXTH RING |
| Diameter | 5.250 INCHES NOMINAL IN |
| Ring Groove Diameter | 4.874 INCHES NOMINAL FIFTH RING IN |
| Ring Groove Diameter | 4.874 INCHES NOMINAL FIRST RING IN |
| Ring Groove Diameter | 4.874 INCHES NOMINAL FOURTH RING IN |
| Ring Groove Diameter | 4.874 INCHES NOMINAL SECOND RING IN |
| Ring Groove Diameter | 4.874 INCHES NOMINAL SIXTH RING IN |
| Ring Groove Diameter | 4.874 INCHES NOMINAL THIRD RING IN |
| Pin | NOT INCLUDED |
| Pin Type for Which Designed | LOCKING |
| Oil Groove | INCLUDED |
| Head Style | DOME |
| Ring Groove Quantity | 6 |
| Skirt Bottom Cutaway Feature | NOT INCLUDED |
| Finished Size Designation | STANDARD |
| Ring | NOT INCLUDED |
| Pin Hole Bushing | NOT INCLUDED |
| Material | STEEL |
| 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 |
|---|---|
| CADH5A PRIMARY | Fairbanks Morse, Llc (USA) |
| Reference | Meaning |
|---|---|
| CADH5A | 3/9 Design control — primary reference U.S. Government activity |
| ADH5A | 5/9 Secondary reference U.S. Government activity |
NSN 2815-00-338-7986 is a Piston,internal Combustion Engin, manufactured by Fairbanks Morse, Llc, classified under FSC 2815, Diesel Engines and Components. Status: active.
NSN 2815-00-338-7986 has 1 manufacturer part number on file: CADH5A (Fairbanks Morse, Llc).
Key specifications for CADH5A: Overall Height: 8.438 INCHES NOMINAL IN; Carbon Groove: NOT INCLUDED; Ring Groove Width: 0.2500 INCHES NOMINAL FOURTH RING IN; Ring Groove Width: 0.1875 INCHES NOMINAL FIFTH 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.