The Ring,piston, cataloged under National Stock Number 2805-00-555-6093, 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8 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-555-6093 |
| 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 | 1 SLOT HORIZONTALLY THROUGH RING |
| Radial Wall Thickness | 0.1430 INCHES MINIMUM AND 0.1550 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 3.4375 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 |
|---|---|
| 4514678-4 | 5/1 Secondary reference Agco Corp Parts Opn |
| 56286 | 5/1 Secondary reference U.S. Government activity |
| MS13931 | 4/1 Identification reference U.S. Government activity |
| MS13931-10 | 2/2 Government specification standardization U.S. Government activity |
NSN 2805-00-555-6093 is a Ring,piston, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 2520-00-734-8164, 5310-01-246-9369. Verify interchangeability with system specifications before substitution.
Key specifications for 2805-00-555-6093: Overall Width: 0.1545 INCHES MINIMUM AND 0.1555 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.