568-391 URETHANE 90 ORINGS -PREM GRADE

U90391 is an AS568-391 clear Polyurethane (AU/EU) 90 Shore A O-Ring with an inside diameter of 21.953 in (557.61 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 22.373 in (568.27 mm). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint.

Polyurethane (AU/EU) is specified here for long wear life in dynamic reciprocating service, very high tensile strength and load capacity. This material stands up to abrasion and wear, extrusion under high pressure, and petroleum oils. Published continuous service range is -65°F (-53.9°C) to 200°F (93.3°C). It is not the right choice where ketones or hot water and steam are present.

Typical settings include hydraulic cylinders, construction machinery, and mining and heavy equipment.

U90391 ships individually. Nominal inside diameter is listed as 22 inch. Review your operating media and conditions against this specification before 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.