In these types of screwdrivers, a spring or ratchet is fitted to the handle.

Hex screwdriver or hexagonal screwdriver.Robertson screwdriver or square screwdriver.Types of ScrewdriversДЇollowing are the types of screwdrivers, which are described below: BladeД«lade is the lower part of the shank. These are generally made of carbon steel. On the upper part either there is a hole through which a wire is passed or this end is made flat so that when this part is fixed to handle it does not allow the shank to move separately. The middle part between the blade and the handle is called the shank. In order to save the wooden handle from being broken, an iron is fixed to the handle. The handle is modelled by the shape ofthe human hand to ensure maximum user comfort.Handle, generally wooden or plastic handles are fixed to the screwdrivers. Screwdrivers can often cause calluses, so it is important to ensure that an ergonomic handle, such as the one on WeraвЂ™s Kraftform Plus, is used for normal applications. When working under tension a VDE screwdriver (recognisable through the colours red and yellow) should be used. For work on small scale screws, WeraвЂ™s Micro screwdriver is recommended. If the screwdriver is sometimes also used for chiselling, a chiseldriver with вЂpound thruвЂ™ blade for heavy-duty should be used. Which kind of screwdriver is chosen depends on the work to be done. This means that the peak loads that cause bit breakage and premature wear are absorbed in this zone вЂ“ enhancing the service life of the bits significantly. The special manufacturing process provides an above average service life.ДЄlso available are stainless bits from Wera, which are ideal when working on a stainless steel surface where the smallest piece of rust can jump over to the stainless surface.ДЇinally, BiTorsion bits have a softer BiTorsion zone, which Wera points out reduces the hardness of the shaft by about 20% in comparison to the drive tip. These bits are designed with a special geometry to meet the extreme demands. It is important the bit does not break, so the solution is the maximum utilisation of the material properties. Impaktor bits are ideal for use with power tools giving high and intense high torque. The Wera Hex-Plus provides larger contact zones in the screw head, which reduces the notching effect to a minimum and protects the profile.ДЄs with profiles, there are common bits used in the fastener industry вЂ“ impaktor, stainless and BiTorsion bits.

For the power transmission, this is a relatively unfavourable constellation, since the stress concentration is very high and can result in deformation of the screw. These are given by the absence of edges and the parallel form of the six profile elements.ДЇinally, the hexagon is one of the best known and most widely used profiles and for sockets there is no alternative. This life extension of the screwdriver and screw results from the low radial forces. When compared to traditional screw profiles, more torque is transferred without damage to the screwdriver and screw when using TORX.

Although this is an improvement, the Pozidriv profile still fights with the problems of slipping.ДЄnother common profile is TORXВ® вЂ“ a star shaped wave profile with six rounded cams. Two additional crosses supply an additional stabilisation during the screwdriving process. The Pozidriv profile is the third common drive profile and is a further development of the cross head profile. The Phillips profile is very often confused with the Pozidriv profile, which in erroneous use leads to damage of tool and screw. Once again, the Lasertip screwdriver can be used here. But, even in this profile the user has to counteract the cam out forces. Compared to the classical form of the slot version, because of the four corners of the Phillips profile the interaction with the screw is quite easy. The second common drive profile is the Phillips defined by two rectangular slot cross sections. The screwdriver tip вЂLasertipвЂ™ from Wera literally bites into the screw without damaging it, taking away this disadvantage. Slotted drives feature a simple slot as a host for the blade, however, they have a disadvantage of a lack of centring вЂ“ making it easy for the tool to slip out of the screw. The five most common drive profiles are slotted, Phillips, Pozidriv, TORXВ® and hexagon. Here Wera Werkzeuge GmbH explains the different types available. Choosing the right equipment for the right application has a huge impact on the result of the work. Screwdrivers and drive bits are crucial elements in mechanical couplings and provide the link between the machine or the hand and the screw.

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