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The Pentalobe shape is a relatively new invention compared to one its cousins, the Hexalobular screw, which many people call a star or Torx. Torx is actually a trademark of Camcar Textron, so the use of its name is another example of genericized trademark , like we use the term Allen Wrench for Hex Keys. The original six pointed profile has similarities to a hex-end head but the sides are concave, providing six points opposed to sides.
Torx is just the opposite, as its design prevents the tool from camming out, providing a better grip in the fastener. Torx screws are used in several applications, from automobiles to computers. They also come in a number of varieties. They come in external versions for use in a socket wrench or ratchet , security with a pin in the center of the screw head to prevent tampering , and what is known as Torx Plus.
When the patent to the original Torx design was about to expire in the early nineties, Textron improved on the design by squaring off the lobes slightly to minimize wear and maximize torque. A standard Torx driver will fit into a Torx Plus screw, but a Torx Plus will not work in a standard so be sure to know which one you will be working with. Finally, a note on sizing and nomenclature: One of the beauties of Torx sizes is that they are universal, meaning there is not an SAE vs Metric version.
They are all the same.
About this item
For the standard Torx, sizes are distinguished using a T before a number. The number is a point-to-point dimension that runs from T1 all the way up to T Some of the most common sizes are T10, T15, and T25, but there are many specialized sizes including T47 and even T5. If you need the security version, an S is added to the end of the number.
External Torx use an E before their size, but do not correspond to the internal sizes. For example, an E8 external Torx is equivalent to a T40 internal Torx. Kinda complicated, huh? Did I mention you can get them with a Ball-end as well?
There is one thing that is not complicated, though, and that is the best Torx tools can be found in one place, KC Tool. Love the Torx head vs hex, Phillips, etc. Knowing a bit of the history and theory is great, thanks for posting this information. Torx is the best, we only use torx screws.
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In order to adjust the valves on a Briggs and Stratton engine, a high quality T hexalobular driver is required. I would like to have one that will stand up to the high amount of torque required to secure the lock nut on my valves. Awesome guide! I work on Mercedes and always notice the different torxs, really good to know the importance of differences.
Interesting to learn some torx history. I just purchased a T6 to install a ruggedized frame on a windows tablet. I see these used more and more often. I have wera hex keys, and want to add a few sets of wera drivers to my tool box at home.
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The bottom line is that you get more surface area to grip on torx. I would love to add to my Wera collection with these. This was a very interesting read. I love that the sizes are universal. Interesting info on the Torx design. I am getting to the point where I want to dispose of all the extra fasteners I have and just buy square, hex, and Torx from now on.