568-389 GREEN HNBR (HSN) 70 ORINGS

APG stocks the HS70389, an AS568-389 green HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 19.953 in (506.81 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 20.373 in (517.47 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.

HNBR (Hydrogenated Nitrile) is specified here for oil resistance of nitrile with substantially better heat capability, excellent abrasion and tear strength. Expect good resistance to ozone and weathering, heat and oxidation, and petroleum oils and fuels. Service temperature is rated from -40°F (-40°C) through 325°F (162.8°C). It should not be specified for service in esters or strong oxidizing acids.

Maintenance and OEM teams specify it across commercial refrigeration, heavy-duty powertrain, and oilfield and downhole equipment.

Reference part number HS70389 when ordering; the item is sold individually. Nominal inside diameter is listed as 20 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.