carriage bolt 1.Size:M2~M42 LTH20-200mm 2.standard:DIN 603 3.surface zp,black,hdg 4stainless steel, steel,etc carriage bolt 1.Size:M2~M42 LTH20-200mmm2.high quality competive price.3.material of carriage bolt:stainless steel ,carbon steel,copper or according require4.surface treatment of carriage bolt:Passivation,Zinc-Plating black or according to customers' requirement!5.can be made with ...