There are many types of screwdrivers available and in recent years many specialized units have been developed such as Tri-wing, Torq-set and Hexalobular However it is unlikely that they will encounter most of the specialized units unless they are working in very specific industries.
We will focus on the three main types of screwdrivers that are in use for general use and in the automotive industry that are slotted, Philips and Pozidriv.
Slotted or also knows that flat head screwdrivers are the oldest of the drive types and was in use at the beginning of 1800 and is one of the most common unit that you will likely see. The flat sheet of the head must coincide with a grove in the slotted screw.
When using a slotted screwdriver, it is always advisable to find the right size driver for the screw the blade tip should be the same width as the screw head and fit snugly into the slot. If an incorrect size is used, the potential for slipping out of the grove into the slotted screw increases considerably and will damage or peel the head of the screw making it very difficult or impossible to screw or remove.
Philips or cross-screwdrivers are the second most common unit. Invented by Henry Phillips in the decade of 1930 was first adopted by the automotive industry and remains the type of dominant unit in the industry to this day. Philips screwdrivers have an X-shaped head that matches an X-shaped edge of screws.
The Philips screwdriver is designed to exit deliberately (screw slippage) once a certain torque level has been reached to help prevent damage to the screw and scratch.
Pozidriv screwdrivers are similar to Philips screwdrivers, but they improve on them. Where the Philips drive is designed the rounded and angled sidewalls so they will jump out the Pozidriv screwdrivers have straight sidewalls and have a second set of cross features set at 45 degrees from the central Cross, also have a small square point. This gives Pozidriv less chance of slipping out of the screw.
One disadvantage of using Pozidriv is that it looks very similar and needs Pozidriv screws. It can be very easy to confuse the different screws and if the wrong controller is used it can damage the screw head.
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