Torx
TORX was developed by CAMCAR/TEXTRON INC., Rockford, Illinois, U.S.A .. Its portion which transfers the tightening torque has hex-globe shape as shown in the figure. The inside TORX is classified as "T"type, and the outside TORX is as "E" type. Drive size represent the sizes of "T' or "E" portion and also applicable tool sizes.
"T"type TROX has a special type which has a projection at the bottom of its hollow.This type of TORX bolt is used for the parts not to be disassembled. (ex: throttle sensor installation and etc.) To remove and install, specific type (with a recess for the projection) of TORX wrench is required. Be careful that the parts using "T" type TORX bolt basically should not be removed or the adjustment is required when reinstalled.