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The breakaway head (also called breakoff or shear fastener) [75] is a high-security fastener whose head breaks off during installation, during or immediately after the driving process, to leave only a smooth surface. It typically consists of a countersunk flat-head bolt, with a thin shank and hex head protruding from the flat head.
A hex shank can be grasped by a 3-jaw drill chuck or held in a chuck specifically for hex shanks. Quarter-inch hex shanks are common for machine screwdriver bits and have spread from that application to be used for drill bits that are compatible with screwdriver machinery. Zero manufacturing if the drill bit is made from hex bar stock
The trade name "Yankee" screwdriver was first marketed by North Brothers Manufacturing Company in ≈16 April 1895, with the No. ≠130 spiral ratchet screwdriver. Yankee soon became and still is a well-known name in automatic spiral ratchet screwdrivers , with several other models, and model improvements patented by North Bros. over a 40-year ...
While the above is a common use of center drill bits, it is a technically incorrect practice and should not be considered for production use. The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The ...
A typical simple screwdriver has a handle and a shaft, ending in a tip the user puts into the screw head before turning the handle. This form of the screwdriver has been replaced in many workplaces and homes with a more modern and versatile tool, a power drill, as they are quicker, easier, and can also drill holes.
A screw gun is similar to a power drill, but designed specifically for driving screws. A screw gun looks like a drill, but has a "nose" instead of a chuck. The nose holds an interchangeable 1 ⁄ 4-inch (6.4 mm) shank bit, commonly known as a tip.
As can be seen in the pictures, a single-lip deep hole drill consists of a tool holder, a shank and the drill head (usually carbide). As far as the design is concerned, it can be generally said that the shank is a few 1/10th of a millimeter to 1 millimeter smaller than the drill head.
Coolant may be introduced via holes through the drill shank, which is common when using a gun drill. When cutting aluminum in particular, cutting fluid helps ensure a smooth and accurate hole while preventing the metal from grabbing the drill bit in the process of drilling the hole. When cutting brass, and other soft metals that can grab the ...
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