The Ring,piston, cataloged under National Stock Number 2815-00-273-0505, is classified within Federal Supply Class 2815 (Diesel Engines and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Cooper Machinery Services Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2815-00-273-0505 |
| Primary Part Number | B-3089 |
| Item Name | Ring,piston |
| FSC / FSG | 2815 / 28 — Diesel Engines and Components |
| Manufacturer | Cooper Machinery Services Llc |
| Status | ACTIVE |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | VERTICAL JOINT |
| Oil Passage Type and Quantity | 1 GROOVE OUTSIDE PERIPHERY |
| Oil Passage Type and Quantity | 1 SLOT HORIZONTALLY THROUGH RING |
| Radial Wall Thickness | 0.5060 INCHES MINIMUM AND 0.5260 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 16.000 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 |
|---|---|
| B-3089 PRIMARY | Cooper Machinery Services Llc (USA) |
| Reference | Meaning |
|---|---|
| S488-5 | 5/9 Secondary reference Kaydon Ring & Seal Inc Dba Skf Precision Technologies |
NSN 2815-00-273-0505 is a Ring,piston, manufactured by Cooper Machinery Services Llc, classified under FSC 2815, Diesel Engines and Components. Status: active.
NSN 2815-00-273-0505 has 1 manufacturer part number on file: B-3089 (Cooper Machinery Services Llc).
Key specifications for B-3089: Overall Width: 0.4960 INCHES MINIMUM AND 0.4980 INCHES MAXIMUM IN; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Joint Style: VERTICAL JOINT; Oil Passage Type and Quantity: 1 GROOVE OUTSIDE PERIPHERY. 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.