Despite the cordless screwdriver and modern bits: Hardly any work can be done properly without a screwdriver. He is not missing in any workshop. All screws with a conventional slot can be screwed in and out with the slot screwdriver. It is one of the most common screwdrivers and is also used to hold screws with metric threads. In addition to its actual purpose, it is also used for all conceivable types of work. It is used as a lever or wedge, is used to open paint cans and glue containers and has proven itself as a mini crowbar and chisel replacement. In addition to the normal flat slot drive, there are hand screwdrivers for cross-head, Internal and external hexagon as well as for Torx screws.
The Phillips system (Designation PH, H or P) can be found on screws with a metric thread, with sheet metal- and Rigips screws. With the wood- or. Spax screws have the Pozidriv cross recess system (PZ, P and Z) enforced. Screws with a Torx drive are relatively new to the wood screw sector (T), die im Me-tall- and automotive engineering have been in use for a long time.
The hexagon head is available for threaded screws (Machine screws) and with wood screws (Wrench screws), while using the hexagon socket head (Inbus) only found with threaded screws. A screwdriver consists of a blade and a handle. The magazine (Griff) is mostly made of plastic today, in rare cases from the hardwood that was used in the past. The booklet should be within easy reach and have a non-slip surface. The blade of a good screwdriver is made of CV steel (Chrom-Vanadium) with matt nickel-plated or glossy chrome-plated surface. The cross-section of the blade is circular or hexagonal. Larger screwdrivers have an additional hexagon for attaching an open-end wrench.
Appropriate tool
The working tip of the screwdriver blade, the downforce, must exactly match the drive shape of the screw head and its size. Otherwise a correct frictional connection is not guaranteed, the screwdriver slips and the screw head or. the workpiece or even the hand will be damaged.
Slotted screwdrivers have the tip running (Cutting edge) Slightly conical in its thickness or is ground to a shovel-shaped hollow on both sides. The width and thickness of the cutting edge are in the ratio of approx 1:5 to each other. The size, with. B. 1,2 x 6 or 1,6 x 8, are on the blade or on the hilt. The widths range from 0,6 mm (Watchmaker's tool) to 14 mm (Power screwdriver), for bits of 4,5 to 8 mm. The blade should fit tightly into the slot and be a little narrower, than the slot is long.
It is easy to confuse the PZ and PH Phillips drives. They differ in the different point angles and thereby, that screwdrivers and screws in the PZ system have four additional notches. One has to be very careful about it, that screw and screwdriver match, otherwise the tool will slip.
Phillips drives come in four sizes (1 to 4) graduated. With the Torx drive, a six-pointed, star-shaped profile, there are sizes T 10, 15, 20, 27, 30 and T 40. The sizes are indicated on the bit or the booklet. Screws with a hexagon socket have the size designation 2, 2,5, 3, 4, 5 and 6 mm, which correspond to the wrench size of the hexagon. Screwdriver with handle for hexagon socket screws, so socket wrench with handle, are available for width across flats from 6 to 13 mm. Larger screws are used with conventional wrenches (Gabel-, Ring-, Sockets or sockets for a ratchet) turned.
Slotted offset screwdrivers are available as special shapes- or Phillips screws, Torx- and for Allen screws. Ratchets are special forms- or screwdriver. Both can be set via idle, that they are just right- or turn to the left. This saves you having to change your grip after every turn. Locked firmly, can be used like a normal screwdriver.
For large power requirements – Rusted or jammed screws can only be loosened with great effort. With screwdrivers with a hexagon on the blade, you can use a wrench as an extended lever.