E70203 is an AS568-203 black EPDM (EPR) 70 Shore A O-Ring built to an inside diameter of 0.296 in (7.52 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.574 in (14.58 mm). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope.
Expect good resistance to phosphate ester hydraulic fluids, ketones, and water and steam. That behavior comes from the compound itself: EPDM (EPR) is widely chosen for strong performance in outdoor and exposed installations, good electrical insulating characteristics. Rated temperature range runs from -65°F (-53.9°C) to 300°F (148.9°C) in continuous service. It is not the right choice where aromatic hydrocarbons or petroleum oils and fuels are present.
Common environments for this compound include HVAC and refrigeration, water and steam systems, and solar and roofing assemblies.
Order part number E70203, sold individually. Unit weight is approximately 0.411 g and nominal inside diameter is listed as 5/16 inch. Review your operating media and conditions against this specification before installation.
Description -203 BLACK EPDM 70D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 0.296 inch (7.52 mm)
Actual Outside Diameter 0.574 inch (14.58 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity