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Lilly Solo
Torx screws are commonly found on automobiles, motorcycles, bicycle brake systems (disc brakes), hard disk drives, computer systems and consumer electronics. Initially, they were sometimes used in applications requiring tamper resistance, since the drive systems and screwdrivers were not widely available. However, as torx drivers became more common, tamper-resistant variants, as described below, were developed.[4] Torx screws are also becoming increasingly popular in construction industries.
By design, Torx head screws resist cam out better than Phillips head or slot head screws.[1] Whereas the tendency of Phillips drivers to cam out under excessive torque has been listed as a feature preventing damage to the screw-head or driver,[5] Torx heads were designed to prevent cam-out. The development of better torque-limiting automatic screwdrivers for use in factories allowed this change. Rather than rely on the tool to slip out of the screw head when a desired torque level is reached (which risks damage to the driver tip, screw head, or workpiece), torque-limiting driver designs achieve a desired torque consistently.
The Torx design allows for a higher torque to be exerted than a similarly sized conventional hex socket head without damaging the head or the tool.[1] The diagram depicts the interaction between the male and female components of a conventional hex drive and a Torx drive. The clearance between the components is exaggerated for clarity.
The green circle, passing through the six points of contact between the two components, represents the direction of the rotational force being exerted at each of those points. Because the plane of contact is not perpendicular to this circle, a radial force is also generated which tends to "burst" the female component and "crush" the male one. If this radial force component is too great for the material to withstand, it will cause the corners to be rounded off one or both components or will split the sides of the female part. The magnitude of this force is proportional to the cotangent of the angle (depicted in orange) between the green circle and the contact plane.
For the Torx type of design, the angle is much closer to 90 than in the case of the hex head, and so for a given torque the potentially damaging radial force is much lower. This property allows the head of the fastener to be smaller for the same required torque, which can be an advantage in applications where space to accommodate the head is limited.
Torx head sizes are described using the capital letter "T" followed by a number ranging from T1 to T100.[6] Some manufacturers and resellers head sizes are also described using "TX" or "Tx" in front of the number.[7][8] A smaller number corresponds to a smaller point-to-point dimension of the screw head (diameter of circle circumscribed on the cross-section of the tip of the screw driver). Common sizes include T10, T15, and T25, while T35 and T47 tend to see specialized use. Only the proper driver can drive a specific head size without risk of damaging the driver or screw. The same series of Torx drivers is used to drive SAE, metric and other thread system fasteners, reducing the number of bit sizes required.
The "external" variants of Torx head sizes (see below) are described using the capital letter "E" followed by a number ranging from E4 to E44.[9] The "E" numbers are different from the "T" numbers of the same size: for example, an E4 Torx socket fits a T20 head.[6]
Although the brand "Torx" generally refers to the standard 6-star-driver or -socket, there are many variations to the original design, including a number made or licensed by Torx. Other tool manufacturers have been producing 8-, 10- and 12-point star drivers and sockets for many decades. The Torx brand is often used universally to describe these and other star driver variations.
A version known as Security Torx, Tamper-Resistant Torx (often shortened to Torx TR) or pin-in Torx contains a post in the center of the head that prevents a standard Torx driver from being inserted. However, the pin allows a smaller flat head screw driver to be used successfully between two adjacent lobes.
A Torx successor, Torx Plus, was introduced around 1990 when the original Torx patent was expiring. The Torx Plus patent subsequently expired in 2011.[16][17] The lobes are more square to allow for higher torque and to minimize wear. The name is shortened to IP (Internal Plus) with sizes ranging from 1IP to 100IP [18] (sometimes listed as IP1 to IP100 [19]) and EP (External Plus) with sizes ranging from 1EP to 42EP as well as smaller sizes ranging from H7EP to H2EP and includes five-lobed tamper-resistant variants.[18] The specifications for these licenses are held by Textron. Standard Torx drivers can be used to drive Torx Plus screws, but not to full torque because of the loose fit. Torx Plus drivers will not fit into standard Torx screws.
A proprietary version of Torx called Torx ttap was developed in 2006 and is licensed by Acument Intellectual Properties.[26] It features a second recess to create a "stick-fit" engagement (branded Frixion Fit), designed to minimize wobbling (branded Stable Drive) without pressing and the need for magnetic bits, a feature that can be important to certain industrial users.[27] Standard Torx drivers can be used to drive Torx ttap screws, but Torx ttap drivers will not fit standard Torx screws.[28]
AudiTorx is a tamper-proof fastener where a convex and smooth fastener head is topped with a break-away Torx drive that snaps off when the engineered torque is reached, leaving a rivet-like bolt head that cannot be easily removed. The main application for these fasteners is in the railroad industry.[29]
An External Torx version exists, also known as Inverted Torx, where the screw head has the shape of a Torx screwdriver bit, and a Torx socket is used to drive it. The external "E" Torx nominal sizing does not correlate to the "T" size, (e.g. an E40 socket is too large to fit a T40 Torx bit, while an E8 Torx socket will fit a T40 Torx bit[6]).
AW drive is a hexalobular-type screw head similar to Torx, with a tapered profile to aid in centering, developed by the Wrth Group in Germany.[30] It is available in five sizes: AW 10, AW 20, AW 25, AW 30 and AW 40.[31]
I'm pretty sure that Autodesk haven't added Torx screws yet. However, you can download custom libraries to use in your content center. Here's a link to a post on the idea page where somebody's made their own: -ideas/torx-screws-in-content-center/idi-p/5217037
We are all familiar with traditional slot-head screws, which require a flat-bladed screwdriver, and cross-head screws, which might be Phillips or Pozidriv. But there are many additional, specialised screw-types including Torx screws.
Torx screws are typically used in vehicles, motorcycles, bicycles, computer systems, hard disk drives and consumer electronics. The unusual star-shaped head makes them far more secure than regular flat-head or cross-head screws and allows higher torque transmission so screws and bolts can be tightened more securely.
Torx screwdrivers have distinctive 6-point star shaped head which mate perfectly with appropriately sized screw heads. The unique Torx design means that there is less likelihood that the screw head will be stripped or the screwdriver damaged. Torx screwdrivers can last up to ten times longer than regular screwdrivers due to the resilience of the design.
The important thing to remember regarding Torx screwdrivers is that the screwdriver size must match the size of the Torx screws. So if you are working with T15 Torx screws then you need a T15 Torx screwdriver. Torx screwdriver sets are available in various sizes.
Security Torx screws are often called Pin Torx due to the additional pin at the centre of the six-point star socket head. This centre pin makes it impossible to use a standard Torx screwdriver, making this type of fastening tamper-proof.
As noted, standard 6 point Torx screwdrivers will not mate with security torx screws due to the additional centre pin in the socket head. To use security Torx screws requires appropriate tools which accommodate the additional security pin.
A further development has been the introduction of the tamper resistant variant of Torx Plus sometimes called Torx Plus Security or Torx Plus TR (tamper resistant). This form uses a 5 point star shaped head socket with a centre pin.
This five-point or five-lobed socket design is generally called a pentalobular socket. The revised design adds a further level of security and requires the use of appropriate tools that mate with the 5-point star socket and central security pin.
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The item arrived slightly bent and having a hole dug in across the Ironwill logo. All cosmetic but it looks like the item was packed in a box with a hundred others and it got jabbed by another one. I have not got to use the actual torx bit. I just thought that for 20$ the quality control would be a bit better.
Thank you for letting us know. This is not up to our standards of quality. We believe this was a shipping issue but it also must have slipped through order fulfillment for some reason. I have sent you a new Torx and requested a photo of this one to help us better understand how this might have slipped past our order fulfillment team. We would appreciate you sending us that photo so we can address your concern. I sent a request through your account email. Thanks again for bringing it to our attention.
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