1.A standard coarse-thread metric cap screw made of steel has a major diameter of 10.0 mm. If a torque wrench is used to tighten the cap screw to a torque of 35 N-m, estimate the axial preload force induced in the cap screw. It may be assumed that the coefficient of friction is about 0.15 for both threads and collar. 2. Engineering specifications for a machine tool bracket application call for a nonlubricated M30 2 threaded fastener of property class 8.8 to be tightened to 100 percent of proof load. Calculate the torque required to accomplish this. It may be assumed that the coefficient of friction is about 0.15 for both the threads and the collar.
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