The Ring,piston, cataloged under National Stock Number 2805-00-273-0417, 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 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 2805-00-273-0417 |
| Primary Part Number | 3900A |
| 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 | 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 | 4 SLOT HORIZONTALLY THROUGH RING |
| Radial Wall Thickness | 0.1030 INCHES MINIMUM AND 0.1150 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 4.000 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 |
|---|---|
| 3900A | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| Reference | Meaning |
|---|---|
| 2.5X3/16 CL20-61 | 5/9 Secondary reference Bosch Automotive Service Solutions Inc. |
| 27327A | 5/9 Secondary reference Hercules Engine Co Inc |
| 2.5X3/16 CL20-61 | 3/9 Design control — primary reference Spx Corp |
| 90IN16030 | 5/9 Secondary reference Kidde-Fenwal, Llc |
| J4106-3B | 5/9 Secondary reference Kidde-Fenwal, Llc |
| 90J4106-3B | 5/9 Secondary reference Kidde-Fenwal, Llc |
| 3900A | 5/9 Secondary reference Hercules Engine Co Inc |
| IN16030 | 5/9 Secondary reference Kidde-Fenwal, Llc |
NSN 2805-00-273-0417 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 2805-00-273-0417 has 1 manufacturer part number on file: 3900A (Brinkley Technology Group Llc Dba Hercules Manufacturing).
2 possible matches (shared part number, not a government interchangeability claim): 6220-01-066-5110, 2895-01-221-2980. Verify interchangeability with system specifications before substitution.
Key specifications for 3900A: Overall Width: 0.1855 INCHES MINIMUM AND 0.1875 INCHES MAXIMUM IN; Cross-Sectional Shape Style: STRAIGHT FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL; 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.