My picture of a self drilling screw.
It looks very much so like a mach. bolt, but the bottom of the bolt does not drill. A pilot hole must first be drilled,(smaller than the bolt) then the mach bolt is inserted into the hole when at the same time it acts like a tap. The bottom looks like a tap, but only about 1/2" up. The threads it makes will accept any normal mach. bolt of the same thread.
[This message has been edited by aphares (edited 12-20-2001).]
