568-172 URETHANE 90 ORINGS -PREM GRADE

APG stocks the U90172, an AS568-172 clear Polyurethane (AU/EU) 90 Shore A O-Ring measuring an inside diameter of 8.237 in (209.22 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 8.443 in (214.45 mm). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

The material holds up against extrusion under high pressure, ozone, and impact and shock loading. That behavior comes from the compound itself: Polyurethane (AU/EU) is specified for toughness that outperforms conventional rubber compounds and long wear life in dynamic reciprocating service. Published continuous service range is -65°F (-53.9°C) to 200°F (93.3°C). It should not be specified for service in prolonged humidity at elevated temperature or ketones.

Typical settings include hydraulic cylinders, off-highway equipment, and high-pressure fluid power.

This item is sold individually under part number U90172. Nominal inside diameter is listed as 8 1/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.