Difference Between T20 And Tx20

: A T20 bit will spin freely in a TX20 brake caliper bolt. That is a $500 mistake on a car.

They have the same point-to-point measurement (3.86 mm) and the same torque rating. Wait, what about Torx Plus? While T20 and TX20 are identical, watch out for Torx Plus (IP20) . These have flatter lobes and difference between t20 and tx20

Whether labeled T or TX, a size 20 bit has specific engineering standards to ensure it fits the intended fastener: TORX - T, TX, E and IP. What is the difference?! : A T20 bit will spin freely in a TX20 brake caliper bolt