When working with drywall, it is easy to pinch a self-tapping screw, due to which the sheets of material are damaged: cracks appear on the gypsum or the cardboard breaks from the outside. In some cases, the cap can go through the GKL, as a result, the sheet will not be pressed against the profile. In any case, due to pinching, the entire structure noticeably loses strength and reliability. A drywall bit with a limiter will avoid these problems.
What it is?
A bit for working with drywall with a limiter is a special attachment for a drill. It is used to prevent pinching the screw when tightening screwdriver. The bit has a stopper that resembles an inverted cup and is wider than the head. When twisting, it rests against the sheet and does not allow the cap to go deep into the body of the sheet.
This restriction allows the master not to be afraid that the screw will be overtightened. But you don’t have to tighten it again, because the bit with the drywall limiter allows you to tighten all the screws tightly enough and deepen them to the required level. As a result, the speed of work is significantly increased, since there is no need to waste time on control and verification. The only thing that is required is minimal skills in working with power tools, because the screws will be screwed in with a screwdriver.
Depth limiting bits are available for various types of materials. When buying, you need to pay attention to the labeling. The nozzle must be designed specifically for drywall, otherwise there is a risk that the material will be damaged. You also need to pay attention to the fact that the markings of the bits and the caps of the screws match. Otherwise, the work will be uncomfortable, the risk of damage to screws, nozzles and even the power tool itself will increase.
Nozzles marked PH 2 are suitable for standard black 3.5 mm drywall screws with a Phillips head.
Selection rules
To choose the right bit, you need to consider the following points:
- Screw diameter. The standard head size for drywall screws is 3.5mm and the appropriate PH 2 bit must be used.
- If the self-tapping screw heads have an eight-beam slot - a cross-shaped recess with four shallow additional beams, then PZ standard bits are used. The device is selected according to the size of the hat.
- Bit length. If the work is carried out in convenient conditions, then a long nozzle is not needed; if work is carried out in hard-to-reach places, then a longer bit may be needed. Usually they are used to create shelves, niches and other architectural elements.
- The durability of the tool depends on what alloy it is made of. The most reliable alloys are chromium with vanadium, tungsten with molybdenum and chromium with molybdenum. A bat made from one of these alloys is guaranteed to last a long time.
- Especially carefully it is necessary to inspect nozzles made in China, because the percentage of rejects, even among chrome-vanadium alloys, is the largest here.
- A small magnetic holder in the nozzle will hold the screws on the end of the bit, so they do not need to be held and they will not fall. This will greatly simplify the process of assembling a drywall structure.
Checking the quality of the holder magnet is simple: after dipping into a bunch of self-tapping screws, at least 3 fasteners should stick to the bit. If less, then the strength of the magnet for comfortable operation is insufficient.
- The bat is picked up only after it has been purchased self-tapping screws, it must match the fasteners, and not vice versa.
Additional coatings increase the service life of the product: nickel protects against corrosion, titanium protects against various mechanical damage, diamond coating makes the bit wear-resistant, and tungsten and carbide add strength.
Features and Benefits of Using the Limit Bit
Nozzle with limiter is a necessary thing when working with drywall. It gives the master very important advantages - the speed and quality of the work performed. Since there will be no damage to the sheet, the rigidity and reliability of the structure will increase. However, the advantages of using a special bit do not end there:
- Regardless of the value of the force set on the screwdriver, the risk of GKL passing through is reduced. This is especially important for novice craftsmen who are not yet accustomed to the tool and do not know how much effort is enough to tighten the screws tightly, and how much will be redundant.
- All hats are immediately flush with drywall, nothing sticks out, does not rise above the surface.
- The price is more than affordable: a quality fixture can be purchased for an amount within 200 rubles. The use of the limiter will pay off very quickly, because due to damage, it will not be necessary to replace the sheets of material with new ones.
A special nozzle is necessary for correct and high-quality work with large volumes of drywall. It makes work better and faster.
