J.I.S. bolts are used in Japanese designed equipment and a large number of U.S. products. Tensile strength is 116,000 PSI. Thread pitch and wrench sizes are as follows (please note A/F=wrench size):
8M = 1.25 Thread Pitch, 12 AF
10M = 1.25 Thread Pitch, 14 AF
12M = 1.25 Thread Pitch, 17 AF