The Ring,piston, cataloged under National Stock Number 2805-00-985-4790, 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 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 2805-00-985-4790 |
| Item Name | Ring,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Status | ACTIVE |
| FSC Application Data | CONVERTER,NITROGEN |
| Cross-Sectional Shape Style | BEVELED FACE, UPPER |
| Radial Wall Thickness | 0.1260 INCHES NOMINAL IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 3.150 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 |
|---|---|
| A1N399 | 5/9 Secondary reference Brooks Automation, Inc. Div Cti Cryogenics |
| 400399 | 3/9 Design control — primary reference Brooks Automation, Inc. Div Cti Cryogenics |
NSN 2805-00-985-4790 is a Ring,piston, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
Key specifications for 2805-00-985-4790: FSC Application Data: CONVERTER,NITROGEN; Overall Width: 0.0980 INCHES NOMINAL IN; Cross-Sectional Shape Style: BEVELED FACE, UPPER; Radial Wall Thickness: 0.1260 INCHES NOMINAL IN. 6 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.