Tweco® heavy duty contact tip accommodates 0.045 inch wire and is perfect for use with 200 to 400A Tweco® No.2, No.3 and No.4 MIG guns as well as specific MIG gun series. Contact tip with excellent electrical properties is ideal for use in heavy duty welding application up to 400 A. It features part number and wire diameter for easy identification. 1.47 inch Contact tip with 1/4 inch-28 UNF-2A thread size has 0.054 inch nominal ID and 0.283 inch OD. Contact tip is made from extruded or gun-drilled 122 DHP copper alloy and machined from a copper alloy tubing to offer a consistent as well as smooth surface of inside diameter with +/-0.003 inch tolerance. It has threaded style that ensures proper contact with a gas diffuser when installed to the MIG gun. It comes in slip-on or thread-on nozzle styles with a choice of diameter bore sizes. Contact tip locks in place when twisted and offers better electrical conductivity with increased surface contact. Contact tip features thick-walled design that acts like a heat sink conducting heat away from the arc source. It can be twisted quarter turn clockwise when tip wear point is reached that reveals a new wear point for doubling the life of the tip.