568-904 URETHANE 90 ORINGS -PREM GRADE

U90904 is an AS568-904 clear Polyurethane (AU/EU) 90 Shore A O-Ring supplied with an inside diameter of 0.351 in (8.92 mm), a cross section of 0.072 in (1.83 mm), and an outside diameter of 0.495 in (12.57 mm). In service, this o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Expect good resistance to impact and shock loading, extrusion under high pressure, and abrasion and wear. That behavior comes from the compound itself: Polyurethane (AU/EU) offers very high tensile strength and load capacity, exceptional abrasion resistance. Rated temperature range runs from -65°F (-53.9°C) to 200°F (93.3°C) in continuous service. Exposure to ketones or prolonged humidity at elevated temperature will shorten service life.

Maintenance and OEM teams specify it across hydraulic cylinders, construction machinery, and mining and heavy equipment.

Reference part number U90904 when ordering; the item is sold individually. Nominal inside diameter is listed as 1/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.