![]() They are Point to Point and Diameter of the screw threads. Two dimensions are important with respect to Torx screws. The following is a Torx Bit Sizes Chart for Internal Torx. The size of the screwdriver or the drive bit must match with the size of the Torx screw.įor example, if you have a screw with TX size, then you have to use a Torx Screwdriver or drive bit of TX size only. They follow a special ‘T’ sizing for the internal Torx an ‘E’ sizing for the external Torx. Like all other fasteners, even Torx screws are available in different sizes. Some other versions of Torx are Torx Paralobe, Torx Ttap, Torx Plus Maxx Stems and Audi Torx. Tamper Proof Torx (Secure Torx) version of the “Plus” had only 5 Lobed instead of 6. This design change resulted in application of even greater torque on the head with minimum wear. The design of the Torx Plus resembled that of a gear with more square lobes. Depending on internal or external drive, the Torx Plus is known as Internal Plus and External Plus respectively. ![]() We will see few details about them before looking at the Torx Bit Sizes Chart.Īfter the original patent expired in 1990, Camcar Textron modified and improved the design of original Torx and released a new version Torx Plus. The main difference between a regular Torx and a Secure Torx screw is the additional security pin in the center of the screw head.Īs a result, you cannot use a standard 6-point Torx screwdriver on a Secure Torx screw.īoth Standard Torx and Secure Torx have several types. Other names are Tamper Resistant Torx, Tamper Proof Torx, Pin-in Torx and 6 Lobe Pin Torx. Two classes of sizes are list in these columns. This is the clearance drill size conversion, or the more plainly, the size drill bit you need to cut your initial hole before carrying out the rest of your tooling. The last segment of the tap drill chart are the columns on the right third of our table. There is a variation of the Torx known as Security Torx. Getting Your Pre-Dilled Hole to the Right Size. They are similar to Nuts and Sockets where the bit or socket goes on top of the screw or nut. There is also a Torx with a reverse design. The regular Torx drive is known as Internal Torx where we insert the bit into the screw head. Both the Torx screws and the screwdrivers can last longer than other drive types. The design of the Torx head prevents this cam-out and thereby causes less damage to head.Įven if you apply a higher torque than the limit on a Torx screw, it will not damage the screw head or the bit itself. It is a process where the screwdriver driver slips out of the screwhead if the torque exceeds a limit. ![]() One common problem with flat-head and Phillips is cam-out. Since the expiry, several manufacturers started producing Torx bits. The generic name for such screw and drives is Star while the popular name Torx is a trademark of Camcar Textron. As a result, many started calling it a Star Screw. The main characteristic of this drive is its 6-point pattern that looks like a star-shaped pattern. Camcar Textron trademarked a special screw drive with the name Torx. ![]()
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