9/64 inch hole in the thds for cotter pin
A headless fastener not exceeding 12 inches (304.8 mm) in length, threaded externally on both ends with threads of the same nominal diameter. All or part of the unthreaded section has a cross-sectional diameter greater than the nominal stud size plus 0.020 inches (0.508 mm). It may be thread relieved. See also stud, locked in.
NSN 5855-01-020-7982
NSN 5895-00-773-2926
NSN 6240-00-725-2274
NSN 6650-01-155-8182
NSN 6135-01-130-3145
NSN 5975-01-571-3604
NSN 5935-01-277-6057
NSN 6135-00-998-5884
NSN 6220-00-151-7539
NSN 5910-01-004-5531
NSN 6650-01-146-8959
NSN 6130-00-295-2758