Reply To: O rings

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Crusher
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If you own a micrometer, you can measure the rings and always know what size you need. For example if the ring is 7.66×1.78 NBR 70.  The first number is the inside diameter. The 1.78  is the thickness or cross -section of the ring. And NBR 70 means it is Buna or "hardness" of 70.

Some are measured in inches and some are measured in mm. 

 

Hope that helps.

 

Crusher