Piston ring types
Piston rings play a very important part in internal combustion engines. They must absorb the combustion pressure, cool the piston, keep the oil in the crankcase and provide a film of oil on the cylinder wall. Most modern 4-stroke engines are usually fitted with three piston rings per cylinder. The first ring holds back the combustion gases. The second ring helps to hold back combustion gases and also scrapes the oil downward. The third ring holds the oil where it needs to be.
Compression rings
| Compression rings | ||
|---|---|---|
| Type | Section (click on the image to enlarge) | Description |
| C1 |  | Rectangular compression ring |
| C2 |  | Taper faced compression ring |
| C3 |  | Internally bevelled compression ring |
| C4 |  | Internally stepped compression ring |
| C5 |  | Ridge dodger ring |
| C6 |  | Keystone compression ring |
| C7 |  | Half-keystone compression ring |
| C8 |  | Taper faced scraper ring |
| C9 |  | Barrel faced compression ring |
| CL |  | L-ring |
Scraper rings
| Scraper rings | ||
|---|---|---|
| Type | Section (click on the image to enlarge) | Description |
| S11 |  | Napier ring |
| S13 |  | Taper faced napier ring |
Oil control rings
| Oil control rings | ||
|---|---|---|
| Type | Section (click on the image to enlarge) | Description |
| O21 |  | Oil control ring |
| O23 |  | Double-bevelled oil control ring |
| O25 |  | Double-bevelled oil control ring |
| WO21 |  | Coil ring-loaded slotted oil control ring |
| WO23 |  | Coil ring-loaded bevelled-edge oil control ring |
| WO25 |  | Coil ring-loaded bevelled-edge oil control ring |
| 3XO |  | 3-piece oil control ring |
Piston Ring Type Standards
Overview of standards used for the different piston ring types:
- DIN 24910: Piston rings for industrial applications 18-1000mm
- DIN 34110: Compression rings for industrial applications 18-1200mm
- VDMA 24910: Piston rings with step cut for industrial applications 18-1000mm
- DIN 70 910 to 70 916: Compression rings for motor vehicles 30-200mm
- DIN 70 930: Compression rings for motor vehicles 30-200mm
- DIN 70 946 to 70 948: Oil control rings for motor vehicles 30-200mm
- ISO 6621 to 6624: Compression rings for internal combustion engines 30-200mm
- ISO 6625 to 6627: Oil control rings for internal combustion engines 30-200mm
Need custom piston rings?
In the case of very specific applications, the necessary piston rings may not be in stock. We also offer options for specially produced piston rings in any desired size and design. Delivery times are possible from 24 hours.
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