The Ring,piston, cataloged under National Stock Number 2805-00-526-1641, 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 U S Army Tank Automotive Command Amsta-Im-Mm. 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 | 2805-00-526-1641 |
| Primary Part Number | 5261641 |
| Item Name | Ring,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| FSC Application Data | GASOLINE ENGINE,NONAIRCRAFT |
| Cross-Sectional Shape Style | BEVELED FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL |
| Oil Passage Type and Quantity | 1 GROOVE OUTSIDE PERIPHERY |
| Oil Passage Type and Quantity | 7 SLOT HORIZONTALLY THROUGH RING |
| Radial Wall Thickness | 0.1570 INCHES NOMINAL IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 3.500 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 |
|---|---|
| 5261641 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 2805-00-526-1641 is a Ring,piston, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-526-1641 has 1 manufacturer part number on file: 5261641 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 5261641: FSC Application Data: GASOLINE ENGINE,NONAIRCRAFT; Overall Width: 0.1875 INCHES NOMINAL IN; Cross-Sectional Shape Style: BEVELED FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL; 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.