The Ring Set,piston, cataloged under National Stock Number 2805-00-388-6644, 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 3 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-388-6644 |
| Item Name | Ring Set,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Status | ACTIVE |
| Ring Set Component Parts | COMPRESSION RING,MS13932-13,@96906,1,COMPRESSION RING,MS13933-13,96906,1,EXPANDER RING,MS13928-2,96906,1,MS13930-5,96906,1,OIL RING,MS13931-19,96906,2 |
| Piston Accommodation Quantity | 1 |
| Standard Bore Diameter | 4.000 INCHES IN |
| 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 |
|---|---|
| C6976 | 5/9 Secondary reference Dana Corp Engine Products Div |
| MS13954-1 | 2/2 Government specification standardization U.S. Government activity |
| RSMS13954-1 | 5/9 Secondary reference U.S. Government activity |
| MS13954 | 4/1 Identification reference U.S. Government activity |
NSN 2805-00-388-6644 is a Ring Set,piston, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 2805-00-388-6645. Verify interchangeability with system specifications before substitution.
Key specifications for 2805-00-388-6644: Ring Set Component Parts: COMPRESSION RING,MS13932-13,@96906,1,COMPRESSION RING,MS13933-13,96906,1,EXPANDER RING,MS13928-2,96906,1,MS13930-5,96906,1,OIL RING,MS13931-19,96906,2; Piston Accommodation Quantity: 1; Standard Bore Diameter: 4.000 INCHES IN. 3 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.