What is the force of of a human punch?

The hardest punch ever recorded or at least of what I know of was a 3150 psi strike that's about 221 kilogram-force per cm sq. The take into account the padded glove which absorbs much of the impact, and then the padded surface of the target and you end up with a number similar to that of an average man swinging a 20 lb sledge hammer with a surface area of about 9 square inches, with a velocity of about 60-70 mph. This is enough force to break any bone in the human body, even if it were safely hidden behind a cinder block