Table of contents: [Hide]
- Types and marking Bit
- PH - Reduction from Phillips
- PZ - Reduction from Pozidrive
- Torx Hole
- SL - Reducing Slot
- Bit material and coating
Everyone who dealt with the construction, repair of premises, household appliances, cars, assembling furniture, know that it is difficult to twist and unscrew a large number of bolts, nuts, screws, screws and other fasteners - the case is not easy, requiring considerable costs of forces and time.
The screwdriver is similar to the electric drill, only instead of drill he has a bit.
With the appearance of screwdrivers and drills with smooth start, work has been much simplified. But the screwdriver without bit is a useless thing.
In the markets of building materials, a huge number of bits from various manufacturers are presented. They have a different look, shape, sizes, color, purpose. They can differ at times.
To the tool serve for a long time and facilitating work, you need to know how to choose the right bit for the screwdriver.
Bit - nozzle used to twist and unscrewing various types of fasteners. For each type of fasteners, the bits are used.
The usual bit is a hexagon metal rod. One part of it is working, is a screwdriver with slots of various configurations depending on the type of fastener used. The second part is the shank inserted into the adapter or the cartridge of the screwdriver.
Types and marking Bit
Back to the categoryPH - Reduction from Phillips
The bit has cruciform slots expanding near the shank and forming an angle of 55 degrees, clearly and securely inserted into the screw head.
Device screwdriver.
Sizes from PH0 to PH4. The digit in the marking indicates the size of the cross. What it is more, the larger bits are the bit. PH0-PH2 particulate bits are used for the most common screws with a diameter of 2.5-3 mm. PH4 is rarely used, during the repair and installation of large-sized structures, in the automotive industry.
The most popular bits of the size of PH2 and PH3 are most popular, they are most often used to wrap all types of black screws, including to twisting thin-walled metal profiles - "bugs".
Standard pH universal, suitable for most other types of self-tapping screws.
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PZ - Reduction from Pozidrive
Bits are used to twist the screws that have the slots of the POZI standard and the average threaded step and universal secret (UP).
This is a cross-shaped bit with 4 large ribs and 4 additional diagonal ribs forming a "double cross". The angle at the top is 50 degrees. This design provides greater than that of the pH bit, the clutch area.
The torque transmitted from the screwdriver to the bit and then to the screw or screw, will be much higher.
Before changing the nozzle from the screwdriver, check whether it is disconnected from the network.
In most cases, PZ bits are used to unscrew the rusted or jammed screws.
The bits of this type are indispensable when screwing the screws in materials having a dense structure, for example, solid wood species, compressed artificial materials. They can be twisted at an angle. Self-tie heads and bits are not damaged.
Sizes from PZ0 for self-tapping screws with a diameter of 2.5 mm to PZ4 for self-tapping screws with a diameter of more than 4 mm and anchor bolts. The most popular sizes pz2 and pz3.
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Torx Hole
The bits of this type were called "asterisks". Provide a reliable grip with bolts and screws, excluding slippage. Used there, where for tightening fasteners you need to apply a lot of effort.The bolts with the heads of this type are most common in cars, appliances.
Marking is two types, such as TORX8 or T8. The diameter is indicated in mm.
For the screwdriver, bits from T8 to T40 are suitable. There are no smaller sizes in various electronic devices, but it will not work using a screwdriver with such bits, you need to use a screwdriver.
Torx Hole asterisks can have an inner hole.
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SL - Reducing Slot
Standard SL - screwdriver with flat-stranded slot of different widths measured in mm.
Marking, for example SL6 or Slot6, means: Bit with flat slot 6 mm wide.
Sizes from SL0 to SL7.
Differ along the length of the rod. May be with or without a limiter. The limiter is used to not be able to wrap fasteners deeper than necessary, for example, when installing drywall. The bits of this standard are used when fastening fasteners into soft materials when the high moment of rotation is required. Could not provide a reliable clutch with a screw of a screw or screw.
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Bit material and coating
Bits for a screwdriver differ in the material from which they are made and caused by the coating that prevents their damage. Accordingly, their price is different.
The durability of the bits is determined primarily by the steel brand. The most reliable were the products of their alloy chromium-vanadium and chromium molybdenum with CR-V and CR-MO marking.
Strength, hardness, anti-corrosion properties of bits increase the coating of its titanium head, titanium nitrite, nickel, tungsten. It increases its service life. If low-quality steel was used in production, the slots are erased after twisting several screws.
If the bit is chosen for a particular type of fastener, it is tight in the slot, providing its reliable fixation. This increases torque from the screwdriver and its service life. If there is a gap, the slots are erased both on the fastener and on the bit.
The correctly selected bit creates comfortable conditions for work, reduces the time for its execution.
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