568-389 URETHANE 90 ORINGS -PREM GRADE

The U90389 is an AS568-389 clear Polyurethane (AU/EU) 90 Shore A O-Ring supplied with an inside diameter of 19.953 in (506.81 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 20.373 in (517.47 mm). This o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

It resists impact and shock loading, ozone, and extrusion under high pressure. That behavior comes from the compound itself: Polyurethane (AU/EU) delivers exceptional abrasion resistance and toughness that outperforms conventional rubber compounds. Rated temperature range runs from -65°F (-53.9°C) to 200°F (93.3°C) in continuous service. Verify compatibility before use with acids and bases or hot water and steam.

It sees regular use in hydraulic cylinders, off-highway equipment, and construction machinery.

Order part number U90389, sold individually. Nominal inside diameter is listed as 20 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.