The Ring,piston, cataloged under National Stock Number 2805-01-189-8607, 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 Mission Systems Wimborne Limited Div Cobham Mission Systems Wimborne Ltd. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-01-189-8607 |
| Primary Part Number | MD31623-163 |
| Item Name | Ring,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Mission Systems Wimborne Limited Div Cobham Mission Systems Wimborne Ltd |
| Status | ACTIVE |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | VERTICAL/DIAGONAL JOINT |
| Oil Passage Type and Quantity | 1 SLOT VERTICALLY THROUGH RING |
| Radial Wall Thickness | 0.0380 INCHES NOMINAL IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 0.553 INCHES AND 0.558 INCHES IN |
| Material | COPPER ALLOY OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| MD31623-163 PRIMARY | Mission Systems Wimborne Limited Div Cobham Mission Systems Wimborne Ltd (GBR) |
| Reference | Meaning |
|---|---|
| MD31623-163 | 5/9 Secondary reference M L Aviation Ltd (incorporating M L Wallop Defence Systems Ltd) |
NSN 2805-01-189-8607 is a Ring,piston, manufactured by Mission Systems Wimborne Limited Div Cobham Mission Systems Wimborne Ltd, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-01-189-8607 has 1 manufacturer part number on file: MD31623-163 (Mission Systems Wimborne Limited Div Cobham Mission Systems Wimborne Ltd).
Key specifications for MD31623-163: Overall Width: 0.0570 INCHES MINIMUM AND 0.5900 INCHES MAXIMUM IN; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Joint Style: VERTICAL/DIAGONAL JOINT; Oil Passage Type and Quantity: 1 SLOT VERTICALLY THROUGH RING. 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.
NSN 2805-01-189-8607 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.