Originally Posted by lucittm (Post 6081290)

It is a shame that someone would produce such a well-finished bolt and then not mark it with their name.

I have heard that many factors can affect the torque reading: thread friction, material friction under the nut, temperature, bolt twist, phase of the moon, etc. But bolt stretch is the engineered way of determining how "tight" the fastener is. I would not have expected a 20 ft. lb. difference in the two methods. Maybe ARP is adding a safety factor for folks without a stretch gauge or the ability to use it properly by decreasing the torque value read from a torque wrench?

Mark