Just to throw petrol onto the fire, what about the thread form? That may also make a difference.
Just to throw petrol onto the fire, what about the thread form? That may also make a difference.
I've just rechecked the thread diameter, and over a thread length of 11/32" and 28TPI, the leading thread diameter is 3/16" and the trailing thread is 13/64", so there appears to be a very slight taper.
These measurements were taken from a virtually brand new screw with an overall length of 1.3/64", with a pan head diameter of 11/32" and a depth of 5/32", followed by a waist of 5/32" diameter for 17/32", and a thread length of 11/32".
Hope this is of some help.
Opportunity is missed by most people, because it is dressed in overalls and looks like work.
any one send me a pic of one i think ive got a full set.coddy.