NBR X-Rings/Quad-Rings The standard size of X-Rings is the same with AS568 O-ring, cross sectional dimensions contain 1.78, 2.62, 3.53, 5.33 and 6 .99mm. NBR X-Rings have good oil resistance and...

FKM Quad-Rings have good resistance to heat, oil and chemical, and also good abrasion resistance and pressure resistance.