Standard taper thread couplers are designed to splice the same diameter bars where one bar can be rotated and the bar is not restricted in its axial direction.It is designed to achieve failure loads in excess of 115% of the characterisitc strength of grade 500 rebar end. Transition taper thread couplers are designed to splice different diameter bars where one bar can be roated and the bar is not restricted in its axial direction. Taper Thread Working Principle: 1.Slice up the end of the rebar; 2.Make the rebar taper thread cut by taper thread machine. 3.Connect together two taper thread end by One piece of Taper Thread Coupler. Taper thread position couplers are designed to quickly splice column sections or precision coupling of elements with multiple bars jointed over a short span, such as prefabricated elements, and the closing of small temporary openings.