The Ring Set,piston, cataloged under National Stock Number 2990-01-227-7170, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-227-7170 |
| Item Name | Ring Set,piston |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Ring Set Component Parts | COMPRESSION RING,16,OIL RING,8 |
| Piston Accommodation Quantity | 24 |
| 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 |
|---|---|
| W9123KX20 | 5/9 Secondary reference Spx Corp |
| W9123KX20 | 3/9 Design control — primary reference Bosch Automotive Service Solutions Inc. |
NSN 2990-01-227-7170 is a Ring Set,piston, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-01-227-7170: Ring Set Component Parts: COMPRESSION RING,16,OIL RING,8; Piston Accommodation Quantity: 24; Special Features: SEALED 289 AND 351 ENGINES; 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.