The Ring,piston, cataloged under National Stock Number 2805-00-273-0345, 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 Brinkley Technology Group Llc Dba Hercules Manufacturing. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-273-0345 |
| Primary Part Number | 3901ASTD |
| Item Name | Ring,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Brinkley Technology Group Llc Dba Hercules Manufacturing |
| Status | ACTIVE |
| Cross-Sectional Shape Style | TAPERED FACE |
| Joint Style | VERTICAL JOINT |
| Radial Wall Thickness | 0.1200 INCHES NOMINAL IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 2.625 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 |
|---|---|
| 3901ASTD PRIMARY | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| 36106 PRIMARY | John Deer Consumer Products Inc (USA) |
| Reference | Meaning |
|---|---|
| CL20-65 | 5/9 Secondary reference Spx Corp |
| 3901ASTD | 5/9 Secondary reference Hercules Engine Co Inc |
| CL20-65 | 5/9 Secondary reference Bosch Automotive Service Solutions Inc. |
NSN 2805-00-273-0345 is a Ring,piston, manufactured by Brinkley Technology Group Llc Dba Hercules Manufacturing, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-273-0345 has 2 manufacturer part numbers on file: 3901ASTD (Brinkley Technology Group Llc Dba Hercules Manufacturing), 36106 (John Deer Consumer Products Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-357-4696, 7910-01-446-4700. Verify interchangeability with system specifications before substitution.
Key specifications for 3901ASTD: Overall Width: 0.1850 INCHES MINIMUM AND 0.1865 INCHES MAXIMUM IN; Cross-Sectional Shape Style: TAPERED FACE; Joint Style: VERTICAL JOINT; Radial Wall Thickness: 0.1200 INCHES NOMINAL IN. 6 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.