A screwdriver is an extremely necessary tool in solving not only domestic but also professional tasks. Torx is a brand of a six-ray star tool.
Textron developed a slot of this shape back in 1967, when it became necessary to manufacture bolts with increased strength. It is this design that allows you to tighten the fastener more.
Manufacturers of most equipment also appreciated the invention and began to use screws with such a head in mobile phones, household appliances. The lack of a suitable tool did not allow the user to unscrew the screws on their own.
The patented technology has been patented under the new name Torx Plus. The development became more reliable and was offered with an anti-vandal option.
The tool, which is indicated by the letters T or TX, has the shape of a tip in the form of a six-pointed star. Inverted Torx External is indicated as E. A feature of the design of such devices is that in the fixture the head is made in the form of a star, while there is a recess on the screwdriver. Most often used in the construction of vehicles, where it is necessary that the bolt head was a minimum diameter. The range of sizes from E4 to E44, but it does not coincide with the usual T.
If there is a TR designation, then this is the Torx Tamper Resistant, the main difference of which is the presence of a special pin in the center of the slot. A special hole is provided on the screwdriver for such a bolt.
There is also a five-beam Torx on sale, it is designated as 5-lobe Torx. In fact, this is a chamomile-shaped slot, it is widely used in Apple technology because it is highly reliable.
There is an improved version on the market with the Plus prefix, in which the ends of the stars are cut off. It is designated as IP. Size range from 1 to 100.
Another option - EP or External Plus comes with a size range from 1 to 42.
Screwdrivers of the same type have different size slots. These parameters are set in accordance with the available standards in millimeters:
- T1 - 0.81;
- T2 - 0.93;
- T3 - 1.104
- T4 - 1.28;
- T5 - 1.42;
- T6 - 1.7;
- T7 - 1.99;
- T8 - 2.314
- T9 - 2.5;
- T10 - 2.74;
- T15 - 3.27;
- T20 - 3.864
- T25 - 4.43;
- T27 - 4.99;
- T30 - 5.52;
- T40 - 6.65;
- T45 - 7.82;
- T50 - 8.83;
- T55 - 11.22;
- T60 - 13.25;
- T70 - 15.51;
- T80 - 17.54;
- T90 - 19.92;
- T100 - 22.13.
Scope of application
Torx slot screwdrivers are necessary not only in the automotive industry, but also in the dismantling of bicycles, ATMs, computer equipment and other electronics. Even if a screw with a hexagon in the head has torn edges of the recess, you can safely unscrew the fastener using screwdrivers of this type.
Most often, you can find such screwdrivers in repair shops where cell phones are disassembled, since almost all modern models are presented with bolts that have slots in the form of a six-pointed star. There are such slots on some components for screws, for example, on hard drives.
Users unfamiliar with the official name often use the term "asterisk". When the development of a new tool was carried out, the first thing that was emphasized was reliability, which should be an order of magnitude higher than that demonstrated by bolts with other slots.
At the time of operation of such a tool, it is necessary to take into account the fact that the screwdriver must fit snugly into the existing hole. If the user sees that there is free space, it means that the size of the head was chosen incorrectly. This is especially evident in non-standard sizes, for example, T47, which cannot be found in the usual set of tools, therefore it is selected as T45, but the screwdriver hangs inside.
The tool must be inserted into the slot until it stops, sometimes the user has to resort to the use of an additional percussion unit.
If these two simple rules are not followed, then the grooves in the screw head can be easily damaged.
How to choose?
Particular attention when buying a quality screwdriver should be given to marking. The numbers indicate the size. There is a table according to which the user is required to act.
The second point is the design of the handle on the instrument. It is better to choose with faces, plastic screwdrivers that will not scroll during operation. Hard plastic can scratch and rub your hand if there is a rubberized pad - this is ideal.
For those who have enough money, professionals are advised to immediately purchase a set of screwdrivers with a hexagonal star. In the future, you don’t have to buy screwdrivers, just select the right size nozzle. As a rule, such sets are delivered in special cases, therefore it is very convenient to store the instrument.
As for the material, the metal part of the screwdriver should be made of high-quality alloy, which has sufficient rigidity. Cheaper models will bend quickly, and there will be no benefit from such a tool, since it will not go into the groove. The shape of the tip must necessarily coincide with the sting on the screwdriver, otherwise you can either tear off the head on the screw or damage the tool. The peculiarity of hexagons is that they are designed for a large load.
The rods can be long and short, vary in thickness and hardness. If you take into account the state standard, then the hardness of the tip of the screwdriver should be between 47 and 52 HRC. If less, then the tool will bend, and more will cause cracks. Only high-alloy chrome steel meets all the necessary requirements. It is designated CR-V. The responsible manufacturer additionally applies anti-corrosion spraying to the surface, which increases the tool life.
For an overview of Torx precision screwdrivers, see the video below.