Quote Originally Posted by Boyan Silyavski View Post
Din912
Yes those.. exactly.

But... 8.8 or 12.9

Like your good ol bolts or tougher machine bolt style.

Does one need high tensile strenght?

I will be tapping in the 4mm steel from box section for the rail. all 200 or so off them.

Carriage bolts will have some extra meat to grip on to (4+5 mm) it has less bolts so ... well more doesnt hurt there.

Grtz Bert.

PS
Where does one buy kinda good machine taps for this purpose, not sure what makes an economical machine tap.








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