The E70257 is an AS568-257 black EPDM (EPR) 70 Shore A O-Ring measuring an inside diameter of 5.859 in (148.82 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.137 in (155.88 mm). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.
EPDM (EPR) is specified here for strong performance in outdoor and exposed installations, good electrical insulating characteristics. It resists phosphate ester hydraulic fluids, ketones, and ozone, UV and weathering. Rated temperature range runs from -65°F (-53.9°C) to 300°F (148.9°C) in continuous service.
Common environments for this compound include water and steam systems, outdoor equipment, and HVAC and refrigeration.
Stocked as E70257 and sold individually. Unit weight is approximately 5.474 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description -257 BLACK EPDM 70D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 5.859 inch (148.82 mm)
Actual Outside Diameter 6.137 inch (155.88 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity