The Ring,piston, cataloged under National Stock Number 2805-00-371-0784, 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8 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 2805-00-371-0784 |
| Item Name | Ring,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Status | ACTIVE |
| FSC Application Data | VALVE,REGULATING,HIGH STAGE BLEEDAIR,ENVIRONMENTAL CONTROLSYSTEM,AIRCRAFT |
| Material Document and Classification | MIL-S-25043 COND 17-7PH MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | VERTICAL JOINT |
| Radial Wall Thickness | 0.1250 INCHES MINIMUM AND 0.1350 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 1.900 INCHES IN |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| 849989-8 | 3/2 Design control — primary reference U.S. Government activity |
| 859989-8 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 2805-00-371-0784 is a Ring,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): 4310-00-621-6339. Verify interchangeability with system specifications before substitution.
Key specifications for 2805-00-371-0784: FSC Application Data: VALVE,REGULATING,HIGH STAGE BLEEDAIR,ENVIRONMENTAL CONTROLSYSTEM,AIRCRAFT; Overall Width: 0.0370 INCHES MINIMUM AND 0.0380 INCHES MAXIMUM IN; Material Document and Classification: MIL-S-25043 COND 17-7PH MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE. 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.