There are two kinds of double end stud. Double-end stud(clamping type-identical ends): studs with screw threads of the same length and configuration on each end. This type of stud serves the function of clamping two bodies together with a nut on each end. Double-end stud(tap end type): a stud designed to be installed in a tapped hole and usually with different threaded lengths on each end. Shanghai Jinrui has more than 15 years experience of producing stud bolt. Our products are widely used in the field of petroleum pipeline to fix flanges,Website:http://www.chinajinrui.net, buildings, machines, etc.  Available Materials: iron, carbon steel, stianless steel,  Steel,aluminum,brass,copper and etc.Heat Treatment: Tempering, Hardening, Spheroidzing, Stress Relieving.Surface Finish: Zinc Plated, Ni-plated, Passivated, Chrome plated. Polish, Black Anodize, Plain, Hot Deep Galvanize(H. D. G. )Grade:4.8-12.9 is acceptable.Sample: Standard samples can be provided for free and customized samples should be charged pertinently. Freight of the sample is charged.MOQ:500pcs Customized is negotiable.Fl