For More Information Visit 3M Electrical Terminals Web Pages Terminal Stud Size Chart Stud Size 3M Terminal US/Inches OUS/Metric Hole Diameter Diameter Diameter 2 0.086 (2,144 mm) M2 2,0 mm (0.080 ) 0.095 (2,4 mm) 4 0.112 (2,844 mm) M2,5 2,5 mm (0.100 ) 0.120 (3,0 mm) 5 0.125 (3,175 mm) M3 3,0 mm (0.120 ) 0.148 (3,8 mm) 6 0.138 (3,505 mm) M3,5 3,5 mm (0.140 ) 0.148 (3,8 mm) 8 0.164 (4,166 mm) M4 4,0 mm (0.176 ) 0.174 (4,4 mm) 10 0.190 (4,826 mm) M5 5,0 mm (0.20 ) 0.200 (5,1 mm) 1/4 0.250 (6,350 mm) M6 6,0 mm (0.24 ) 0.265 (6,7 mm) 5/16 0.3125 (7,938 mm) M8 8,0 mm (0.32 ) 0.328 (8,3 mm) 3/8 0.375 (9,525 mm) M10 10,0 mm (0.40 ) 0.397 (10,1 mm) 7/16 0.4375 (11,113 mm) M10 10,0 mm (0.48 ) 0.450 (11,4 mm) 1/2 0.500 (12,700 mm) M12 12,0 mm (0.48 ) 0.515 (13,1 mm) 5/8 0.625 (15,875 mm) M16 16,0 mm (0.64 ) 0.656 (16,7 mm) 3/4 0.750 (19,050 mm) M18 18,0 mm (0.72 ) 0.781 (19,8 mm) Ref: ISO 263-1973 for inch stud sizes and ISO 262-1973 for metric stud sizes.