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#438 6 1/4" ID x 6 3/4" D x 1/4" CS Hydrogenated Nitrile 70 Durometer
O-Rings are round rubber washers that are placed around the valve stem in order to create a seal, preventing leaking from occurring and providing an excellent resistance to vibration. The listed size is referenced from AS568 dimensions, which is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers.
Hydrogenated Nitrile Specs:
- ASTM D 1418 Designations: HNBR
- ASTM D 2000, SAE J200 Type/
- General Temperature Range: -25 to +300 Degrees (F)
HNBR Performs Well In:
- Automotive applications
- Oil field applications
HNBR Does Not Perform Well In:
- Hydrocarbons (chlorinated)