Threaded metric fasteners are available in several systems, two of which are coarse and fine (Table\n32.1). Finer threads are not cut as deep and as a
Threaded metric fasteners are available in several systems, two of which are coarse and fine (Table
\r\n32.1). Finer threads are not cut as deep and as a result have a larger tensile stress area for the same
\r\nnominal diameter. (a) Determine the maximum preload that can be safely achieved for coarse pitch
\r\nand fine pitch threads for a 12 mm bolt. (b) Determine the percent increase in preload of fine
\r\nthreads compared to course threads. Coarse pitch = 1.75 mm and fine pitch = 1.25 mm. Assume the
\r\nproof strength for both bolts is 600 MPa.