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26-496: T8 or T-8 may refer to the following: Measurement [ edit ] T8, a Torx screwhead size T8, a 1 inch fluorescent lamp size A tornado intensity rating on the TORRO scale Biology [ edit ] The 8th thoracic vertebra The T8 spinal nerve Transportation [ edit ] Trikke 8, a scooter-like vehicle An OS T1000 train class model, used on

52-704: A 20% higher applicable torque. A Torx successor, Torx Plus , was introduced around 1990 when the original Torx patent was expiring. The Torx Plus patent subsequently expired in 2011. 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 (sometimes listed as IP1 to IP100 ) 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. 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

78-583: 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 ). AW drive is a hexalobular-type screw head similar to Torx, with a tapered profile to aid in centering, developed by the Würth Group in Germany. It is available in five sizes: AW 10, AW 20, AW 25, AW 30 and AW 40. T-Star plus has

104-449: 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. Some manufacturers and resellers head sizes are also described using "TX" or "Tx" in front of

130-457: A mechanical component, the pin, to disconnect the shafts. The use of shear pins as torque limiters has been well known since at least the early 20th century. A synchronous magnetic torque limiter uses permanent magnets mounted to each shaft, with an air gap between. They are very fast acting, but may have more backlash than mechanical types. Because there is no mechanical contact between the two shafts, they are also used to transmit torque through

156-421: A physical barrier like a thin plastic wall. On some models, the torque limit may be adjusted by changing the gap between the magnets. A ball detent type limiter transmits force through hardened balls which rest in detents on the shaft and are held in place with springs. An over-torque condition pushes the balls out of their detents, thereby decoupling the shaft. It can have single or multiple detent positions, or

182-525: 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. Security Torx has its own set of variations, and many other variations of Torx drives are available in Security or TR versions. These include five- and seven-lobed TR heads. Torx Paralobe is a further developed Torx Drive System with 6% longer flanks which results in

208-421: A rotating collar accessible to the user which is indexed and held in place with its own separate ball detents. This mechanical type uses a spring to hold a drive pawl against a notch in the rotor. It may feature automatic or manual reset. A compression adjustment on the spring determines the torque limit. This type is similar to a friction plate clutch. Over-torque will cause the plates to slip. A simple example

234-415: A similar screw drive design to Torx ttap and was introduced in 2005 by German fastener manufacturer Altenloh, Brinck & Co under its brand name Spax . Torque limiter A torque limiter is an automatic device that protects mechanical equipment, or its work, from damage by mechanical overload. A torque limiter may limit the torque by slipping (as in a friction plate slip- clutch ), or uncouple

260-424: A snap acting spring which requires a manual reset. There may be a compression adjustment to adjust the torque limit. Many cordless drills incorporate this type of torque limiter in a planetary gearset . It may be a part of an assembly of multiple gearsets used to primarily reduce speed and multiply torque as well as perform ratio changes. The torque limiter is typically the last gearset in the transmission . It uses

286-426: 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. An External Torx version exists, also known as Inverted Torx , where the screw head has the shape of a Torx screwdriver bit, and

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312-737: Is different from Wikidata All article disambiguation pages All disambiguation pages Torx 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. 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. Whereas

338-472: Is found in a fixed-spool fishing reel , where the slipping torque is set by means of a large hand nut in order that the reel will turn and allow more line to unwind before the line breaks under the pull of a fish. A magnetic particle clutch can be used effectively as a torque limiter. The torque setting fairly approximates a linear relationship with the current passing through the windings, which can be statically or dynamically set depending on needs. This type

364-454: 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

390-422: 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. The "E" numbers are different from the "T" numbers of the same size: for example, an E4 Torx socket fits a T20 head. Although the brand "Torx" generally refers to

416-933: The Oslo Metro Airport & South Line , a rail service in Sydney numbered T8 Île-de-France tramway Line 8 , one of the Tramways in Île-de-France T8 road (Tanzania) , a road in Tanzania Other [ edit ] One of the Hong Kong Tropical Cyclone Warning Signals used by the Hong Kong Observatory Tekken 8 , a 2024 video game The International Telecommunication Union prefix for Palau YouTube Channel based on The Lion King See also [ edit ] 8T (disambiguation) [REDACTED] Topics referred to by

442-420: 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

468-406: 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. The diagram depicts the interaction between the male and female components of a conventional hex drive and a Torx drive. The clearance between

494-478: The load entirely (as in a shear pin ). The action of a torque limiter is especially useful to limit any damage due to crash stops and jams. Torque limiters may be packaged as a shaft coupling or as a hub for sprocket or sheave . A torque limiting device is also known as an overload clutch . Disconnect types will uncouple the drive, with little or no residual torque making its way to the load. They may reset automatically or manually A shear pin type sacrifices

520-411: The load on the sun gear to the annulus and thereby stalling the output until torque is reduced to an amount where the ball detents can lock the annulus again. This system equally limits torque in both directions of rotation and also works with the sun gear as the input. The compression of the ball detents (and therefore the amount of torque at which the limiter is utilized) is typically adjusted by means of

546-581: 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. 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. Standard Torx drivers can be used to drive Torx ttap screws, but Torx ttap drivers will not fit standard Torx screws. AudiTorx

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572-405: The number. 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

598-433: The planet carrier as the input with the sun gear as the output, and the annulus normally locked. A series of ball detents act on the annulus to lock it, allowing power to be transmitted from the planet carrier to the sun gear. When the torque transmitted through the gearset reaches a determinate amount, the torque acting on the annulus causes it to unlock from its ball detents and freely rotate, causing power to be diverted from

624-447: The same term This disambiguation page lists articles associated with the same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=T8&oldid=1206125738 " Category : Letter–number combination disambiguation pages Hidden categories: Short description

650-454: 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

676-420: 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, 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

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