What are the commonly used specifications of six lobe screw?

Six lobe screw contain pan head torx screw, countersunk head torx screw, round head torx screw, cap head torx screw and so on, do you know what standard they refer to ? For example, what’s the size of torx should be made in M4’s countersunk screws?

Screw head type refers to JIS B111 standard countersunk head six lobe screw, head size is 7.5-8.0, it should use the standard T20 driver.

T1 T2 T3.. T20 T25 T30.. T60 are often said in the six lobe screw. So what’s the size it is ? How large is its circumcircle or incircle? A variety of torx specifications are enclosed for your reference. If you are not sure what’s the torx size you need , welcome to consult to SHI SHI TONG: annie.li@szsst88.com