... ,Metric, GB 245201.O ring detail for reference:1. Size : O ring circle diameter (C.D) Minimum0.44mm. ... .Rubber moulding over 2000 setsWorker 150Staff25QC5Main productso rings, gaskets,custom rubber parts.Material Nitrile(NBR), HNBR, EPDM,Silicone, ... , Flame Resistance,Heat resistance,Low and High temperature Resistance, Oil and Fuel Resistance, Animal and Vegetable Oil Resistance, Alcohol Resistance, ...