Tap and die set

[Johnboy]

I use thread forming taps at work in aluminium a fair bit. Work fine and it should be a stronger thread. Different size tapping dril though as the material is formed and not cut. No swarf so no problem in blind holes.

John

 

[MusicMan]

Interesting about the progressive or serial taps, not seen those before. Sets I have seen have all cut full thread depth but with varying amount of taper.

Wrong about the tapping drill though. The correct size drill is the nominal diameter minus the pitch. So for M10 x 1.5 pitch the drill would be 8.5mm

John

Thanks John, true!

Keith