MPS Import and stock a large range of Imperial and Metric O-Rings from approved and globally recognised manufacturers in standard NBR and high spec materials for various industries.
|NBR 70A or 90A
|-40° - +220° F||O’ring Groove Design
As important as the o’ring seal itself is the groove that the o’ring seats into. The groove must be designed to accommodate not just the o’ring size, but also its intended usage; be it dynamic or static operation, radial or axial loading, vacuum or high pressure.
The following information is a guide for o’ring groove dimensions for both static and reciprocating dynamic applications. The info is based on 70 Shore A Durometer hardness only.
Generally surface finish for sealing surfaces are as follows…
63RMS maximum: For non-critical sealing surfaces such as groove sides
32RMS maximum: For static sealing on critical sealing surfaces such as groove base and top.
16RMS maximum: For dynamic sealing surfaces and for sealing gases in a face type sea
|-22° - +212° F||0 - 7250
Application For These Machines