Ring Gaps, Precision Rings Incorporated

Ring Gaps

Selection of the proper ring gap configuration is important in sealing ring applications. Acceptable leakage rates, size of the ring and type of assembly are factors that help determine the proper gap configuration of the sealing ring. Shown here are the most common ring gap configurations.

	SQUARE CUT gaps are the most practical and economical ring gaps. Recommended for most applications. Good leakage control.
	ANGLE CUT gaps (right or left cut) are widely used on rotating seals. Rings should be oriented so the leading edge points in the direction of rotation. Rings with an angle gap decrease the tendency to score at the gap.
	TITE JOINT gaps are sometimes applied to contracting and snap rings so that they can be easily removed from the groove.
	STEP CUT gaps are used where two rings per groove are not practical. The step cut is used to prevent a direct flow path between the piston and cylinder. Cross section must be larger to accommodate strength to the steps.
	HOOK STEP gaps are used for blind assembly or when ring must pass ports in the cylinder wall. Limits free expansion.
	MITRE STEP gaps are the only single rings that have tighter leakage control than any other single ring. Used on larger diameter rings when using one ring per groove.