The O-Rings Meet MIL-R-83248C and ASTM D2000/SAE J200. They offer excellent resistance. Temperature range is -15° to +400° F. hardness is A75. Color is black
Face collars are an option for one or each face and prevents the shaft or bushing from moving side to side. Flat Precision Face Collars are used in conjunction with Thrust air Bushings.