Dynamic Reciprocating O-Ring Gland Design

In reciprocating sealing applications there is a back and forth or reciprocating motion along the shaft axis between the inner and outer parts of the gland. O-rings are often referred to as piston and rod seals when used in these types of applications. The table below lists recommended dimensions for Dynamic Reciprocating seal glands by AS-568A O-ring dash numbers.

Static Radial Glands

Axial Internal Pressure

Axial External Pressure

Dynamic Rotary Glands

Dynamic Reciprocating

Static Crush Glands

Dovetail Glands

Gland Design Home

Dynamic Reciprocating Gland Design

O-rings and seals in dynamic radial applications should consider the following; temperatures, motion or vibration, squeeze, stretch, friction and types of friction. Columbia Engineered Rubber Inc, provides the basic o-ring gland design for theses applications. See table below. There are a number of factors that should be carefully considered when designing the gland for a dynamic o-ring seal. The chart below provides a standard set of guidelines to assist you in your design.

-The elastomer selection should directly correlate with the type of application in which the o-ring seal will be used. You can review our materials/elastomer section to examine the primary qualities of the material type under consideration.

Dynamic Reciprocating Seal Gland Design Diagram

Due to the number of interacting forces, it is STRONGLY RECOMMENDED THAT YOUR ELASTOMER SELECTION BE RIGOROUSLY TESTED IN THE ACTUAL APPLICATION, performance assumptions must be checked so that you are certain that all variables have been carefully considered.

Dynamic Radial Glands

AS# -004
-475

AS568 -004 through -475 Dynamic Reciprocating Seal Design Guidelines
AS-568 DASH#	O-ring	Gland (E)	Actual	%		Gland Width (L)			Groove
AS-568 DASH#	Cross Section	Depth	Squeeze	Squeeze	Clearance	No Back Up	One Back Up	Two Back up	Radius
-004 to -050	.070 +/-.003	.055 to .057	.010 to .018	15 to 25	.002 to .005	.093 to .098	.138 to .143	.205 to .210	.005 to .015
-102 to -178	.103 +/-.003	.088 to .090	.010 to .018	10 to 17	.002 to .005	.140 to .145	.171 to .176	.238 to .243	.005 to .015
-201 to -284	.139 +/-.004	.121 to .123	.012 to .022	9 to 16	.003 to .006	.187 to .192	.208 to .213	.275 to .280	.010 to .025
-309 to -395	.210 +/-.005	.185 to .188	.017 to .030	8 to 14	.003 to .006	.281 to .286	.311 to .316	.410 to .415	.020 to .035
-410 to -475	.275 +/-.006	.237 to .240	.029 to .044	11 to 16	.004 to .007	.375 to .380	.408 to .413	.538 to .543	.020 to .035