568-258 URETHANE 90 ORINGS -PREM GRADE

Ordered as U90258, this is an AS568-258 clear Polyurethane (AU/EU) 90 Shore A O-Ring with an inside diameter of 5.984 in (151.99 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.262 in (159.05 mm). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

Polyurethane (AU/EU) is specified here for long wear life in dynamic reciprocating service and outstanding extrusion resistance at elevated pressure. It resists ozone, petroleum oils, and impact and shock loading. Continuous operating temperature is published at -65°F (-53.9°C) to 200°F (93.3°C).

Maintenance and OEM teams specify it across hydraulic cylinders, construction machinery, and high-pressure fluid power.

U90258 ships individually. Nominal inside diameter is listed as 6 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.