The Ring,piston, cataloged under National Stock Number 2805-00-684-2221, 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 Naval Air Warfare Center Aircraft Div. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-684-2221 |
| Primary Part Number | 58A154B2 |
| Item Name | Ring,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Naval Air Warfare Center Aircraft Div |
| Status | ACTIVE |
| FSC Application Data | RACK,BOMB,AIRCRAFT |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | VERTICAL JOINT |
| Radial Wall Thickness | 0.0250 INCHES MINIMUM AND 0.0300 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 0.562 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 |
| Part Number | Manufacturer |
|---|---|
| 58A154B2 | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| 58A154B2 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| 58A154B2 PRIMARY | Naval Air Warfare Center Aircraft Div (USA) |
NSN 2805-00-684-2221 is a Ring,piston, manufactured by Naval Air Warfare Center Aircraft Div, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-684-2221 has 3 manufacturer part numbers on file: 58A154B2 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), 58A154B2 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 58A154B2 (Naval Air Warfare Center Aircraft Div).
Key specifications for 58A154B2: FSC Application Data: RACK,BOMB,AIRCRAFT; Overall Width: 0.0300 INCHES MINIMUM AND 0.0310 INCHES MAXIMUM IN; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Joint Style: VERTICAL JOINT. 7 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.