T55 x 55mm 1/2" Drive Torx Star Socket Male T-Star Cr-V Steel AU638

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Torx isn’t perfect, as they are a rather tight tolerance. It can be difficult to insert the driver if they collect gunk in an engine bay, for example. I’d take that over a Phillips fastener that would rather cam its driver out of the fastener than apply enough torque to break it loose. Brandan Gillogly

Torx is an innovative fastener system designed to overcome the shortcomings of traditional screw fasteners. The drive systems used by various fasteners have a huge impact on productivity and product quality. For example, an inefficient drive system will increase assembly time and therefore eat into profitability. As previously noted - the original Torx drive system was developed by Camcar Textron in 1967. But this early specification has undergone some beneficial development and improvement highlighted in this post. Drive System Issues in ProductionHave you noticed that the effective cross-sectional size of Torx Plus is larger than the regular Torx profile? Compatibility Thus, while Torx offers tremendous advantages over traditional fasteners hex, the Torx Plus is a better option for assemblies that need a tighter grip. Advantages of Torx Plus The most common sizes are T10 and T25. The head height is 0.062 inch (1.6 mm). The head diameter is 0.50 inch (1.27 cm). Some other specialized sizes include T55 and T27. The 15° drive angle of the Torx makes it less effective for high-speed applications and assemblies. If used in high-speed assemblies, the fastener head might strip, delaying assemblies and potentially damaging the assembly and tools used. The improved design enables the Torx plus driver bits to deliver nearly double the amount of drive cycles and bit life.

Another bit of terminology that can be confusing is when referencing internal Torx vs external Torx. When talking Torx bits, we’re actually referring to an internal Torx head. In other words, the bit is inserted into the head of the fitting. The metric system is a good fit for larger distances. It is not as accurate for smaller distances. Tamper-Proof There are also a lot of emergency DIY methods out there, such as softening a piece of plastic and shaping it to fit. However, these other methods are just as prone to failure. In the end, it’s usually much cheaper to simply buy an actual star bit set. Torx Bit Sizes Charts Internal Star Bit Sizes Size Examples include vehicles, motorcycles, computer systems, bicycles, consumer electronics, and hard disc drives. Tamper Proof Torx What is Tamper Proof Torx?For example, if you have a screw with TX size, then you have to use a Torx Screwdriver or drive bit of TX size only. These fasteners also don’t wobble, so they’re suitable for applications that require high accuracy, like electronics and automobile industries. Polydrive (RIBE) What is a Polydrive Screw? The Polydrive, or RIBE, is a fastener similar to the Torx. To the untrained eye, they may even look interchangeable. These fasteners also have a spline-shaped geometry with rounded ends, cut as a recess into the fastener head, that allows secure fastening, increases torque transfer, and minimizes cam-out. The Torx Plus, also known as the Internal Plus, is an improved version of the original design. This version is designed to provide better torque transfer than the original design. The lobes on the screw allow for increased torque without causing much wear on the tool. As shown, Torx clearly outperforms other drive systems when considering factors of importance in production environments. But Torx is far from perfect which is what led to the development of Torx Plus.

Here’s a summary of just some of the issues associated with various typical, commonly used drive systems. Hex Drive The Torx Ttap drive is compatible with the standard Torx drive. However, if you’d like the advantages the Torx Ttap offers, you have to use it with the Ttap drive. The geometries of these drives are exactly the same, except for the additional recess in the screw head’s center. Uses of Torx TtapThe TORX(r) Drive System was invented by Camcar Textron in 1967. It was designed to provide an alternative to the slotted-head screwdrivers of the day. The patented system is trademarked by Acumen Intellectual Properties, LLC. Other manufacturers often use the Torx name to promote their products. While it’s common to use the terms Torx and star interchangeably, there’s actually a bit of a difference between the two. Much like the Allen wrench, Torx is a trademarked name and refers to a specific brand, whereas star is the generic name (much like hex keys). However, there is a difference beyond just licensing. The Polydrive fasteners are similar to the Torx system, but the geometry differs sufficiently that the drives are not interchangeable. So, a Polydrive bit can’t be used on a Torx screw, and vice versa. They do the same job, though, and their performance is comparable. Uses of Polydrive (RIBE) Hex bolts and nuts have that problem, Allen bolts, which are in internal hex, have that problem. There is a fastener that doesn’t have that problem. Torx. Is that an SAE T55 Torx or is that a metric T55 Torx? Nope, it’s just a T55 Torx. The fasteners are used for both metric and SAE threads. The graduations between Torx sizes make them pretty easy to eyeball as well. Torx fasteners and drivers have been around since 1967, when the six-pointed star pattern was invented by Bernard Reiland at Camcar and patented in 1971.