(349) Static Sealing Most O-Rings are used in static service (the O-Ring and metal surfaces remain relatively fixed). They may be applied as face seals or radial seals. In face seal
applications, the O-Ring should seat against the low pressure side of the groove .
Dynamic Sealing The O-Ring moves relative to the mating surface. A moving seal may be further classified by the type of motion: reciprocating,
oscillating, or rotating.
The greatest number of dynamic seals are used in reciprocating service in cylinders, valves, and linear actuators. Oscillating
motion is encountered in swivels and valve stems.
When an O-Ring is used on a rotating shaft, it should be limited to light duty where the shaft ...
(20) Durometer: O-Ring sizes for Boss Tube Fittings are available in both 70 & 90 Durometer.
Application: providing a seal for straight-thread tube fittings on a boss.
Numbering System: The two digits after the -9 represent the Tube Size O.D. in 16ths of an inch. For example -905 is sized for a Tube O.D. of 5/16". The one
exception is for -901 where the Tube Size O.D. is 3/32".
(860) O-Ring Stretch As a general rule of thumb the groove I.D. should stretch the O-Ring I.D. by between 1 to 3% and by no more than 5%. Exceeding
this limit may over stress the material.
Groove Design Groove depth should be less than the cross sectional width of the O-Ring. The groove width
should be wider than the cross sectional width of the O-Ring in order to accommodate O-Ring compression.
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