Bi-chromated surface finishing是什么意思
在加拿大 metric size hexagonal flanged Bolts and Nuts as shown and described below… Description : Metric Hexagonal flanged Bolt with nut Screw to ISO 965-8/total internal thread MA DIN 13 and nuts to ISO 934-8. Quenched and Tempered. Neoprene washe...华人论坛