Designed for applications that require passing counterbores and retaining ring grooves.
Step Ring
Restricts oil flow by eliminating the straight path.
Under Cut
The lower edge of the working surface is cut. While being a pressure ring, it also performs as an oil control ring.
Notch
Enhances the close fit between piston ring and cylinder wall.
Double Keystone
The cross section is wedge-shaped from both sides. Excellent in preventing ring sticking.
Slip In
Increases lubrication of oil between the ring and cylinder liner.
Big Inside Cut
Inside surface is cut to allow the ring to be inclined during operation. So that the ring working surface lower edge line contact with the cylinder wall to assist initial running-in.
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