We want to tighten an ASTM A193 bolt having 4-8 UN threads and a yield strength of 96 ksi. The effective length of its body, Lbe, is 12 in.; that of its threads, Lse, is 4 in. We're going to control the buildup of preload by measuring bolt elongation.
How much elongation do we want to create if the target tension is 80 ksi?