contact tips

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I'm going to be needing .030 contact tips for my old welder,would any brand matter?Drink a Guinness Draught....Millermatic 140Do you still rememberDecember's foggy freeze --when the ice thatclings on to your beard isscreaming agony.
Reply:You will likely have to bring a sample when you go to purchase.  There are so many brands and variations.  Some are threaded: fine, coarse, Imperial , Metric, and varying diameters.  Some have no threads.    Even in a workplace with multiple welding machines and different gun leads it is wise to take the old tip to the parts bin.
Reply:Good advice there,I'll have to take the old one off to compare,thanks.Drink a Guinness Draught....Millermatic 140Do you still rememberDecember's foggy freeze --when the ice thatclings on to your beard isscreaming agony.