View Full Version : how does friction drilling+tapping work?

02-04-2013, 03:47 PM

Those taps must be really hard to tap this now hardened zone, isn't it so?

02-04-2013, 04:02 PM
On mild steel like most structural shapes (tube, angle, channel, square tube, I beam, etc.) the material won't be much harder if any. A good quality tap with cutting oil will sail right through that hole, especially a spiral point tap.

Jaakko Fagerlund
02-04-2013, 05:21 PM
Yep, there is no carbon added or oxygen making oxides, so it isn't that much harder than the base material. Maybe somewhat harder, but probably not noticably.

And in case you want to tap something hardened, they do make carbide taps.