On Wednesday, December 11, 2013 2:44:19 PM UTC-5, Larry Jaques wrote:



Absolutely not! You want the force spread out to reduce friction and

allow all the power to pull the stud in.


Within reasonable limits increasing the area does not reduce the friction.

From Marks Handbook, "Under moderate pressures the frictional force in proportional to the normal load on the rubbing surfaces. It is independent of the pressure per unit area of the surfaces."

It is not intuitively obvious.


Dan