The Ring,piston, cataloged under National Stock Number 2805-00-659-6437, is classified within Federal Supply Class 2805 (Gasoline Reciprocating Engines, Except Aircraft; and Components) of the Engines, Turbines, and Components group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-659-6437 |
| Item Name | Ring,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Status | ACTIVE |
| Cross-Sectional Shape Style | CONVEX FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL |
| Joint Style | VERTICAL JOINT |
| Oil Passage Type and Quantity | 1 GROOVE OUTSIDE PERIPHERY |
| Oil Passage Type and Quantity | 9 SLOT HORIZONTALLY THROUGH RING |
| Radial Wall Thickness | 0.1920 INCHES NOMINAL IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 4.875 INCHES 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 |
| Reference | Meaning |
|---|---|
| 600R339 | 5/9 Secondary reference Oshkosh Corp |
| 600R339 | C/1 Advisory reference — outside the item-of-supply concept Oshkosh Defense Llc |
| R602A305 | 3/9 Design control — primary reference Teledyne Continental Motors Industrial Products Div Teledyne Industries Inc Sub of Teledyne Inc |
NSN 2805-00-659-6437 is a Ring,piston, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
Key specifications for 2805-00-659-6437: Overall Width: 0.2485 INCHES MINIMUM AND 0.2490 INCHES MAXIMUM IN; Cross-Sectional Shape Style: CONVEX FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL; Joint Style: VERTICAL JOINT; Oil Passage Type and Quantity: 1 GROOVE OUTSIDE PERIPHERY. 8 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.