Torque Control 7
As you can see, each fastener, even from identical lots having relatively the same mechanical properties, will give you different torque values for the same preload. The K value can be thought of as
summarization of anything and everything that affects the relationship between torque and preload. The following is a brief list of some estimated K factors that we have found in our laboratory. The list is intended to be used only as a suggestion and will actually vary per application.
