The Ring,piston, cataloged under National Stock Number 2805-00-274-3331, 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 Trackmobile Llc. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-274-3331 |
| Primary Part Number | 3911A |
| Item Name | Ring,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Trackmobile Llc |
| Status | ACTIVE |
| Material Document and Classification | WS 85-1 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | STRAIGHT FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL |
| Joint Style | VERTICAL JOINT |
| Oil Passage Type and Quantity | 1 GROOVE OUTSIDE PERIPHERY |
| Oil Passage Type and Quantity | 8 SLOT HORIZONTALLY THROUGH RING |
| Radial Wall Thickness | 0.1540 INCHES MINIMUM AND 0.1640 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 3.750 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 |
|---|---|
| 3911A PRIMARY | Trackmobile Llc (USA) |
| 78220A PRIMARY | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| H3911A | Linde Material Handling North America Corporation (USA) |
| Reference | Meaning |
|---|---|
| H3911A | 5/9 Secondary reference Linde Lift Truck Corp. |
| 78220A | 5/9 Secondary reference Hercules Engine Co Inc |
NSN 2805-00-274-3331 is a Ring,piston, manufactured by Trackmobile Llc, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-274-3331 has 3 manufacturer part numbers on file: 3911A (Trackmobile Llc), 78220A (Brinkley Technology Group Llc Dba Hercules Manufacturing), H3911A (Linde Material Handling North America Corporation).
1 possible match (shared part number, not a government interchangeability claim): 2815-00-805-2644. Verify interchangeability with system specifications before substitution.
Key specifications for 3911A: Overall Width: 0.1860 INCHES MINIMUM AND 0.1865 INCHES MAXIMUM IN; Material Document and Classification: WS 85-1 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: STRAIGHT FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL; Joint Style: VERTICAL JOINT. 9 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.