Thread: Where to buy an 8-40 forming tap (or set)

I'd be cautious with forming taps, all the ones I've used produce quite a loose thread and a raised ridge around the hole. My preference is for cut taps but forming taps are stronger but do take a little more force to start.
I'll check my toolbox tomorrow but I'm not likely to have one.

If you're going to tap them in a machine try to avoid any taps with straight flutes (hand taps) as they block and break too easily, machine taps have spiral flutes that pull the swarf out the top of the hole or spiral point that push the swarf out the bottom of the hole (deep or thru holes only)