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

your link is 1/8 unc and I think is not the same as 8/40.
I use lots of taps but never come across 8/40,
This guy has 8/40 and maybe the same stuff you looking for,
https://tradetools.co.nz/shop/thread...econd-hand-tap

Else, visit your local engineer shop, usually, they are helpful and you can swap if you bought the wrong stuff.

Depends on how many threads you planning to do or how much you want to spend
I would start with just tapper or starting tap.