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We are attempting so secure a hardware supplier in China for for one of our Chinese contract manufacturers.The hardware we are trying to source are the following:Hex Jam Nut 3/8-16 thread pitch, 9/16 across flats by 7/32 thickThe metric equivalent would be 9.5mm x 1.59 thread pitch, 14.3mm across flats, 5.5mm thick.Hex Jam Nut 7/16-14 thread pitch, 3/4 across flats by 17/64 thick.The metric equivalent would be 11.11mm x 1.81 thread pitch, 19mm across flats, 6.75mm thick.This is a common hardware in the US but we have had some difficulty sourcing it in China. Initial order quantity would be 5000 pieces each but could go to 50, 000 once we are in full production.Material is zinc plated steel. hex, jam, nut Steel hex jam nuts, 3/8-16 & 7/16-14