Because T20 and TX20 reference the exact same standard, they share identical dimensions. The geometry of a standard 6-point star drive is precisely measured from point to opposite point. Measurement (Metric) Measurement (Imperial) 0.152 inches Maximum Torque Range 12.7 to 13.2 Nm 9.3 to 9.7 lbf·ft
The label is simply an alternative abbreviation used by specific tool brands. Some manufacturers choose "TX" to emphasize the "X" shape of the six-point star or to differentiate their product line in catalogs without violating strict trademark guidelines. For example, prominent European tool manufacturers often use the "TX" prefix (e.g., TX20, TX25) in their official product descriptions and laser engravings.
Understanding the naming conventions, standard dimensions, and variations of these star-shaped fasteners will help you select the right tools for your project. The Origin of the Names: Torx vs. TX difference between t20 and tx20
Approximately 3.86 mm (0.152 inches). This is the measurement from one apex of the star to the opposite apex.
The "T20" is a specific size within the standard internal Torx family. According to the standard Torx bit size chart, a T20 bit has a point-to-point measurement of approximately 0.151 inches (3.86 mm). This size is considered a medium Torx bit, larger than a T15 but smaller than a T25. It is capable of handling a maximum torque range of 7.74 to 9.37 Nm. Because T20 and TX20 reference the exact same
They are fully compatible and interchangeable. If you have a screw labeled TX20, a T20 bit will fit it perfectly. 🛠️ Hardware Pro-Tip: T20 vs. TX20
Because of these geometric tweaks, the mechanical performance of these two bits varies drastically. Some manufacturers choose "TX" to emphasize the "X"
Let’s look at the raw physics. While T20 and TX20 are "size equivalent" they perform drastically differently.
To help clarify your specific project needs, could you tell me you are working with (e.g., wood, automotive, electronics) and what tool you plan to use (e.g., hand screwdriver, impact driver)? I can recommend the best bit material and torque settings for your job. Share public link