This standard specifies the length of incomplete threads and the shape and dimensions of thread relief grooves that apply to the threads of commonly used male threaded parts.
JIS B 1006:1985 history
2009JIS B 1006:2009 Fasteners -- Thread run-outs for external thread in accordance with ISO general purpose metric screw threads
1985JIS B 1006:1985 Thread run-outs and thread undercuts for external threaded fasteners