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2mm CS x 38.5mm ID x 42.5mm OD Buna-N 90 Durometer Metric O-Ring (JIS S39) Part number H2.00X038.5 is a black Buna-N (Nitrile, NBR) 90 durometer metric O-Ring with a 2.00mm cross-section, a 38.50mm inside diameter and a 42.50mm outside diameter. It is the standard JIS B 2401 S39 size. It is made to ISO 3601-1 dimensional tolerances and ISO 3601-3 Grade N surface quality and is sold by The O-Ring Store LLC, an ISO 9001:2015 certified O-Ring...