The Ring,piston, cataloged under National Stock Number 2805-00-529-2991, 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 | 2805-00-529-2991 |
| Primary Part Number | 5292991 |
| 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 |
| Largest Radial Wall Thickness | 0.160 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN |
| Smallest Radial Wall Thickness | 0.155 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INSIDE COUNTERBORE, STRAIGHT FACE |
| Ring Style | ECCENTRIC |
| Surface Treatment | CHROMIUM OUTSIDE PERIPHERY |
| 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 |
|---|---|
| 5292991 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 2805-00-529-2991 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 2805-00-529-2991 has 1 manufacturer part number on file: 5292991 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 5292991: FSC Application Data: GASOLINE ENGINE,NONAIRCRAFT; Largest Radial Wall Thickness: 0.160 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN; Smallest Radial Wall Thickness: 0.155 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN; Overall Width: 0.0780 INCHES NOMINAL IN. 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.