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| R Rectangular |
| ET Half keystone ring |
| T keystone ring |
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R This is a compression ring with a rectangular cross section and with its geometrically simple form provides an adequate seal under normal operating conditions. |
T This is a compression ring with both sides tapered and is used in those cases when ring sticking can be expected. Due to its wedge shape, any radial movement of the ring will alter its axial clearance and thus minimize the build up of combustion residues. |
ET This is a compression ring with both sides tapered. |
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M Taper faced ring |
N Napier ring |
NM Taper faced Napier ring |
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M This compression ring has a tapered running surface which is intended to shorten its running-in period. At the start, the ring and cylinder are in line contact only but with high unit pressure which also acts at the running surface of the ring provides however some slight relief. Due to their oil scraping action. These rings are often used as an aid in controlling the oil consumption of an engine. |
N This ring can be considered as a compression ring with an oil scraping property. The recess in the ring causes it to twist in a manner similar to the compression rings. The lower edge of the running surface makes contact with the cylinder. |
NM Taper-face scraper ring (Stepped) |
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| Lp compression rings with an L-shaped cross section commonly installed in small 2-strokr engines in order to improve control of the gas flow through the cylinder ports. Due to its resistance to flutter. |
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G Double-bevelled oil control ring |
G Similar to the type Bevel-Edged oil control ring but by chamfering the edges of both lands in same direction, the oil scraping effected is even further improved. |
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D Bevelled-edge oil contrlo ring |
| D In order to achieve a further increase in unit pressure and thereby a better oil scraping effect the outside edges of both lands are chamfered. |
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SSF Oil control ring with spiral Expander |
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3S Multi-piece steel-rail oil Control ring |
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| SEF Flex oil expander type slotted Oil control ring |
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