The Ring,piston, cataloged under National Stock Number 2815-00-273-0597, is classified within Federal Supply Class 2815 (Diesel Engines and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Cummins Inc.. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2815-00-273-0597 |
| Primary Part Number | 65997 |
| Item Name | Ring,piston |
| FSC / FSG | 2815 / 28 — Diesel Engines and Components |
| Manufacturer | Cummins Inc. |
| Status | ACTIVE |
| Ring Width Pin Hole Depth | 0.106 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | BEVELED FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL |
| Joint Style | VERTICAL JOINT |
| Oil Passage Type and Quantity | 1 GROOVE AND 6 SLOT OUTSIDE PERIPHERY |
| Radial Wall Thickness | 0.1650 INCHES MINIMUM AND 0.1750 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 4.000 INCHES IN |
| Pin Hole Style | HALF ROUND PINHOLE AT JOINT |
| Pin Hole Slot Length | 0.125 INCHES NOMINAL IN |
| Material | IRON OVERALL |
| 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 |
|---|---|
| 65997 PRIMARY | Cummins Inc. (USA) |
| Reference | Meaning |
|---|---|
| A65997 | 5/9 Secondary reference Cummins Inc. |
NSN 2815-00-273-0597 is a Ring,piston, manufactured by Cummins Inc., classified under FSC 2815, Diesel Engines and Components. Status: active.
NSN 2815-00-273-0597 has 1 manufacturer part number on file: 65997 (Cummins Inc.).
Key specifications for 65997: Ring Width Pin Hole Depth: 0.106 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN; Overall Width: 0.1860 INCHES MINIMUM AND 0.1865 INCHES MAXIMUM IN; Cross-Sectional Shape Style: BEVELED FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL; Joint Style: VERTICAL JOINT. 10 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.