How to choose a TIG cup size
A TIG cup (gas nozzle) decides how the shielding gas reaches the tungsten electrode and the weld pool. Pick the wrong size and you notice it in poor gas coverage, discolouration or a torch that does not fit into the corner. Here is how to choose the right one.
What does the number on the cup mean?
Almost every cup carries a number, for example #8, #12 or #16. That number is the inside diameter in sixteenths of an inch:
- #8 is 8/16 inch, about 12.5 mm.
- #12 is 12/16 inch, about 19 mm.
- #16 is 16/16 inch, so 1 inch or about 25 mm.
A higher number is therefore a wider cup. A wider cup covers a larger area with gas.
Small or large cup?
Small cup (for example #4 to #8): reaches into corners and tight spots, and you see more of the work. The gas coverage is smaller, so you have to stay closer to the workpiece.
Medium cup (for example #10 to #12): the standard choice for a lot of welding, such as pipe and plate in steel and stainless.
Large cup (#14 and up): gives a bigger gas shield. That helps with materials that are sensitive to oxidation, such as titanium and stainless, and with welds that use a longer electrode stick-out.
Will the cup fit my torch?
Cups are made for a specific torch type. Our cups fit standard WP9, WP17, WP18 and WP26 TIG torches. Check the torch type and size of the option you choose on the product page. For some combinations you need a gas lens or an adapter. Also read what a gas lens is.
Pyrex, ceramic or Teflon?
The material decides what you see and how much heat the cup can take. Pyrex is transparent, ceramic is tougher and more heat resistant. You can read more in our comparison Pyrex or ceramic.
Still not sure?
Use our selection guide. You answer a few questions and see which cup, gas lens and collet fit your torch. You can also look at all TIG cups right away.