The Ford Barn - View Single Post - 7/16-14 thread chaser

Pete · 07-20-2020, 08:42 PM

Most threads in the parts we are talking about (flathead Ford engines) are "standard" class 2 threads as used in assembly line production.This is normally a 77% thread. A class 2 tap will not remove metal from a class 2 threaded hole unless the the female thread is damaged.

Myths get started by very intelligent people "creatively" answering a question rather than spending the time to look up the correct answer. Once a myth gets started, it is hard to dispell.

07-20-2020, 08:42 PM	#19
Pete Senior Member Join Date: May 2010 Location: Wa. Posts: 5,403	Re: 7/16-14 thread chaser Most threads in the parts we are talking about (flathead Ford engines) are "standard" class 2 threads as used in assembly line production.This is normally a 77% thread. A class 2 tap will not remove metal from a class 2 threaded hole unless the the female thread is damaged. Myths get started by very intelligent people "creatively" answering a question rather than spending the time to look up the correct answer. Once a myth gets started, it is hard to dispell.