Keystone
Keystone is one of the compression ring types that is durable
under heavy loads and is highly effective in preventing ring
stick (a phenomenon in which the ring sticks to the ring
groove).
As with barrel-faced, some keystone rings have barrel-faced
contact surfaces that make contact with the cylinder wall.
In addition, there are two types of keystone: single-sided
keystone where only one side (upper surface) is tapered, and
double-sided keystone where both sides are tapered.
Mainly used in top rings.
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