The Ring,piston, cataloged under National Stock Number 2805-00-540-7545, is classified within Federal Supply Class 2805 (Gasoline Reciprocating Engines, Except Aircraft; and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-540-7545 |
| Primary Part Number | 1778669 |
| Item Name | Ring,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| FSC Application Data | POWER DRIVES,MISSILE LAUNCHING SYSTEM |
| Material Document and Classification | AMS 7311 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | STEP JOINT |
| Radial Wall Thickness | 0.1620 INCHES MINIMUM AND 0.1720 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 4.125 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 |
| Part Number | Manufacturer |
|---|---|
| 1778669 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
NSN 2805-00-540-7545 is a Ring,piston, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-540-7545 has 1 manufacturer part number on file: 1778669 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 1778669: FSC Application Data: POWER DRIVES,MISSILE LAUNCHING SYSTEM; Overall Width: 0.1860 INCHES NOMINAL IN; Material Document and Classification: AMS 7311 ASSN STD 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.