The Piston,internal Combustion Engin, cataloged under National Stock Number 2815-00-528-5704, 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 28 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2815-00-528-5704 |
| Primary Part Number | NFA5L |
| Item Name | Piston,internal Combustion Engin |
| FSC / FSG | 2815 / 28 — Diesel Engines and Components |
| Manufacturer | Fairbanks Morse, Llc |
| Status | ACTIVE |
| Carbon Groove | INCLUDED |
| Ring Groove Width | 0.1260 INCHES MINIMUM FIRST RING IN |
| Ring Groove Width | 0.1270 INCHES MAXIMUM SECOND RING IN |
| Distance Between Pin Bosses | 1.844 INCHES MINIMUM AND 1.906 INCHES MAXIMUM IN |
| Retaining Ring Groove | INCLUDED |
| Surface Finish | FINISHED |
| Ring Groove Position and Quantity | NUMBER 1,NUMBER 2,NUMBER 3,NUMBER 4,NUMBER 5,AND NUMBER @6 PISTON ALL RINGS |
| Oil Passage Type | HOLE LOCATION NOT OTHERWISE SPECIFIED |
| Diameter | 4.250 INCHES NOMINAL IN |
| Ring Groove Diameter | 3.865 INCHES MINIMUM FIFTH RING IN |
| Ring Groove Diameter | 3.865 INCHES MINIMUM FIRST RING IN |
| Ring Groove Diameter | 3.865 INCHES MINIMUM THIRD RING IN |
| Ring Groove Diameter | 3.873 INCHES MAXIMUM FOURTH RING IN |
| Ring Groove Diameter | 3.873 INCHES MAXIMUM SECOND RING IN |
| Ring Groove Diameter | 3.873 INCHES MAXIMUM SIXTH RING IN |
| Distance From Pin Hole Center to Extreme Top | 3.060 INCHES MINIMUM AND 3.064 INCHES MAXIMUM IN |
| Pin | INCLUDED |
| Pin Type for Which Designed | LOCKING |
| Oil Groove | NOT INCLUDED |
| Head Style | FLAT |
| Ring Groove Quantity | 6 |
| Skirt Bottom Cutaway Feature | NOT INCLUDED |
| Finished Size Designation | STANDARD |
| Ring | INCLUDED |
| Pinhole Diameter | 1.7474 INCHES MINIMUM AND 1.7514 INCHES MAXIMUM IN |
| Pin Hole Bushing | NOT INCLUDED |
| Material | IRON CAST |
| Skirt Type | SOLID |
| 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 |
|---|---|
| NFA5L PRIMARY | Fairbanks Morse, Llc (USA) |
| AVP10561-2052ALT4PC1 | Naval Sea Systems Command (USA) |
| AVP10S61-2052ALT4PC1 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| AVP10S61-2052ALT4PC1 | 5/9 Secondary reference U.S. Government activity |
| 13NF4A5PC1 | 5/9 Secondary reference U.S. Government activity |
| 23NF6A5PC1 | 5/9 Secondary reference U.S. Government activity |
| AVP10561-2052ALT4PC1 | 5/9 Secondary reference U.S. Government activity |
| NFA5L | 3/9 Design control — primary reference U.S. Government activity |
NSN 2815-00-528-5704 is a Piston,internal Combustion Engin, manufactured by Fairbanks Morse, Llc, classified under FSC 2815, Diesel Engines and Components. Status: active.
NSN 2815-00-528-5704 has 3 manufacturer part numbers on file: NFA5L (Fairbanks Morse, Llc), AVP10561-2052ALT4PC1 (Naval Sea Systems Command), AVP10S61-2052ALT4PC1 (Naval Sea Systems Command).
Key specifications for NFA5L: Overall Height: 5.312 INCHES NOMINAL IN; Carbon Groove: INCLUDED; Ring Groove Width: 0.1260 INCHES MINIMUM FIRST RING IN; Ring Groove Width: 0.1270 INCHES MAXIMUM SECOND 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.