Coarse Threaded Copper Nozzle with 0.625" bore size is designed for standard gas diffuser and is machined from a solid copper alloy bar to provide consistent dimensional stability as well as efficient heat dissipation. 1.75" Nozzle with 1.07" OD is ideal for use in medium to heavy duty welding application up to 450 A. It features part number rolled stamped on the outer surface for easy identification. It has a 2-piece design and is made of 145 tellurium copper alloy. Nozzle with recess contact tip relationship 0.125 - 0.156" is best suited for higher heat applications requiring longer electrical stick-out or in cases where the nozzle touches the work piece.