The Ring Set,piston, cataloged under National Stock Number 2805-01-021-4286, 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 Kalmar AC Inc. Government technical data includes 3 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-01-021-4286 |
| Primary Part Number | 4908680-4 |
| Item Name | Ring Set,piston |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Kalmar AC Inc |
| Status | ACTIVE |
| Ring Set Component Parts | COMPRESSION RING,CF-3195,SEALED POWER CORP,4,COMPRESSION RING,CF-3196,SEALED POWER CORP,8,OIL RING,CF-3198,SEALED @POWER CORP,8,EXPANDER RING,CF-3402,SEALED POWER CORP,4 |
| Piston Accommodation Quantity | 4 |
| Standard Bore Diameter | 3.125 INCHES IN |
| 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 |
|---|---|
| 4908680-4 PRIMARY | Kalmar AC Inc (USA) |
| F135T104 | Renk America Llc Div Renk America (USA) |
| Reference | Meaning |
|---|---|
| M-6448KX | 5/9 Secondary reference Spx Corp |
| 9325KX | 5/9 Secondary reference Spx Corp |
| F135T00104 | C/1 Advisory reference — outside the item-of-supply concept Renk America Llc Div Renk America |
| 74908680 | C/1 Advisory reference — outside the item-of-supply concept Kalmar AC Inc |
NSN 2805-01-021-4286 is a Ring Set,piston, manufactured by Kalmar AC Inc, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-01-021-4286 has 2 manufacturer part numbers on file: 4908680-4 (Kalmar AC Inc), F135T104 (Renk America Llc Div Renk America).
Key specifications for 4908680-4: Ring Set Component Parts: COMPRESSION RING,CF-3195,SEALED POWER CORP,4,COMPRESSION RING,CF-3196,SEALED POWER CORP,8,OIL RING,CF-3198,SEALED @POWER CORP,8,EXPANDER RING,CF-3402,SEALED POWER CORP,4; Piston Accommodation Quantity: 4; Standard Bore Diameter: 3.125 INCHES IN. 3 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.