568-439 URETHANE 90 ORINGS -PREM GRADE

APG stocks the U90439, an AS568-439 clear Polyurethane (AU/EU) 90 Shore A O-Ring supplied with an inside diameter of 6.475 in (164.47 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.025 in (178.44 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.

As a material, Polyurethane (AU/EU) offers toughness that outperforms conventional rubber compounds and long wear life in dynamic reciprocating service. Expect good resistance to extrusion under high pressure, petroleum oils, and ozone. The material carries a published service range of -65°F (-53.9°C) to 200°F (93.3°C). Applications involving ketones or hot water and steam call for a different compound.

Common environments for this compound include off-highway equipment, hydraulic cylinders, and high-pressure fluid power.

Order part number U90439, sold individually. Nominal inside diameter is listed as 6 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.