Tweco style Contact Tip 11-40 for Aluminum (25 pk)

11-40 is a contact tip for .035 welding wire on Tweco style #1 and Mini-Mig welding guns. It is 1 inch long, has an M6-1 thread and is 1/4 inch diameter at the weld surface.  The 11-40 contact tip has a slightly larger orifice at the weld surface for using aluminum mig welding wire.