Ordered as U90261, this is an AS568-261 clear Polyurethane (AU/EU) 90 Shore A O-Ring measuring an inside diameter of 6.734 in (171.04 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 7.012 in (178.1 mm). The o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.
The material holds up against ozone, extrusion under high pressure, and abrasion and wear. That behavior comes from the compound itself: Polyurethane (AU/EU) is valued for long wear life in dynamic reciprocating service and outstanding extrusion resistance at elevated pressure. The material carries a published service range of -65°F (-53.9°C) to 200°F (93.3°C). Applications involving ketones or prolonged humidity at elevated temperature call for a different compound.
It sees regular use in construction machinery, hydraulic cylinders, and high-pressure fluid power.
Order part number U90261, sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description 568-261 URETHANE 90 ORINGS -PREM GRADE
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 6.734 inch (171.04 mm)
Actual Outside Diameter 7.012 inch (178.1 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Premium