When two parts have to be fastened together, you use either a nail or a screw. The nail or screw keeps the two parts together and keeps it from falling apart. When constructing a cabin, the frames are usually held in place by a number of nails. In some countries, a set of nails are necessary have when it comes to carpentry. For years, nails have held together numerous pieces of furniture, walls, and even boats. Like nails, screws are also used to fasten two separate parts together. The difference between a screw and the nail is their appearance. Nails have smooth sides while screws have grooved sides.
Carpenters and do-it-yourself enthusiasts use nails of various sizes for different projects. The same thing is applicable for fasteners. There are several types of screws and each type has its own recommended purpose or use.
Bosch Cordless Tools
Here are the different types of screws:
Dowel screw - This fastener is perfecting for connecting wood on either ends. These screws are grooved on both ends thus allowing you to attach panels on either ends. For example, on one end you can attach the top part of the table and on the other end you can attach the table leg. Roundhead screw - This is one of the most popular types of fasteners. Made from a strong material you can use this fastener on both wood and metal. The round head is usually left visible on the surface. Flathead screw - The all-around type of fastener. You can use this type of fastener to fasten almost anything. With the grooves, not reaching all the way up you can sink this fastener into the surface making it barely visible from the top. Dry wall screw - A good number of houses use dry wall. The dry wall screw is the perfect type of screw for dry walls. This screw is thin but is sturdy enough to support picture frames hung on dry walls.
There are still other types of screws available. Each of these fasteners has a specific purpose thus it is recommended that you use the right type of screw.
Black Friday Bosch PS21-2A 12-Volt Max Pocket Driver 2011 Deals
Nov 16, 2011 05:59:15
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Black Friday Bosch PS21-2A 12-Volt Max Pocket Driver Feature
- Compact and Lightweight - Shortest height and head length along with lightest weight make this tool great for overhead/tight area work.
- 2 Speeds (1st-0-350 RPM / 2nd - 0-1,300 RPM) - Up to 2X Faster driving and drilling than competition
- Universal Bit Holder - Only universal bit holder in its class which clamps on all common bits (C6+E6)
- 20+1 Clutch Settings - Perfect torque adjustments for precise screw driving
- Improved LED Light - Light to illuminate working area
Black Friday Bosch PS21-2A 12-Volt Max Pocket Driver Overview
Weighing in at 1.8 lbs., the Bosch PS21-2A 12-Volt Max Two-Speed Pocket Driver offers twice the torque of the competition, which makes it perfect for heavy-duty jobs. With a variable-speed trigger and two speed options (0-350 RPM / 0-1,300 RPM) and 20 clutch settings, this tool will allow for precise drilling and driving in wood, soft- to medium-bodied metal, and much more. The Bosch Universal Bit Holder is the only universal bit holder in its class which clamps on all common bits. Additionally, the PS21-2As low-profile design makes it ideal for work in tight spaces. Includes: Bosch PS21-2A 12-Volt Max Two-Speed Pocket Driver, two lithium-ion 12-Volt Max batteries, 30-minute charger, and carrying case.Black Friday Bosch PS21-2A 12-Volt Max Pocket Driver Specifications
At just 1.8 pounds, the Bosch PS21-2A 12-Volt Max Two-Speed Pocket Driver offers twice the torque of the competition, making it tough enough for heavy-duty jobs. A variety of speed options and clutch settings allow for precise drilling and driving in wood, soft- to medium-bodied metal, and more. Additionally, the PS21-2A's low-profile design makes it ideal for work in tight spaces.
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 The most compact and most powerful screwdriver in its class. View larger. |
With a 5.6-inch head length for optimum balance and control, the Bosch PS21-2A is ideal for working in small spaces or tight corners. And weighing only 1.8 pounds, it's also lightweight enough for repetitive work and overhead tasks.
A soft grip adds comfort and control to this lightweight pocket driver, reducing operator fatigue and making it easier to work for longer periods of time. For further ease of use, a bright LED illuminates dark areas.
Twice the Torque of the Competition
The Bosch PS21-2A supplies up to 265 inch-pounds of torque--that's twice as much torque as the competition--so you can drill through wood and 22-gauge metal or fasten and drive nuts, bolts, and screws.
Adjustable Clutch for Diverse Applications
The PS21-2A easily switches between a low gear of 0 - 350 RPM and a high gear of 0 - 1,300 RPM. The low gear is ideal for driving screws and drilling in heavy-duty materials, while the high gear provides faster speeds for lighter drilling work. Twenty additional clutch settings allow for secondary adjustments, so you'll always have the right torque for the job.
Variable-Speed Trigger Increases Control
The Bosch PS21-2A is equipped with a variable-speed trigger that helps you ease into the desired speed, giving you optimum control for drilling and driving. By starting slow, you can keep the bit from wandering; increasing the speed will help the drill bit or screw engage firmly with the material.
ProVantage Guarantee
The Bosch PS21-2A comes with the ProVantage three-year tool protection plan, which guarantees two years of free battery replacements and three years of tool protection. The plan allows tool replacement for one year and free tool repair for the second and third years.
What's in the Box
Bosch PS21-2A 12-Volt Max Two-Speed Pocket Driver, two lithium-ion 12-volt Max batteries, 30-minute charger, and carrying case.
 Weighing only 1.8 pounds, the PS21-2A is ideal for overhead work. |  265 inch-pounds of max torque let you drive through mild metal and wood. |
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