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2. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   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 ...

3. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   A #80 drill bit. Number drill bit gauge sizes range from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest). Although the ASME B94.11M twist drill standard, for example, lists sizes as small as size 97, sizes smaller than 80 are rarely encountered in practice.

4. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Example (inch, fine): For 7 ⁄ 16-20 (same diameter as the previous example, but this time with 20 threads per inch, which is considered fine), 0.437 in × 0.90 = 0.393 in (i.e., if the threads are to be fine, then a slightly larger diameter drill bit should be used before tapping the hole for the screw).

5. Annular cutter - Wikipedia

   en.wikipedia.org/wiki/Annular_cutter

   HSS core drills are made from high-speed steel material. These are the most popular core drills or annular cutters in the market. HSS core drills are cheaper for smaller diameters i.e. 40 mm. The HSS core drill, unlike the TCT core drills, has the ability to re-sharpen. HSS core drills are re-sharpened and used until the desirable length is ...

6. Hughes Tool Company - Wikipedia

   en.wikipedia.org/wiki/Hughes_Tool_Company

   This included the drill bit (well) and tool joint product lines critical for oil and gas drilling, some of the first technologies for ram blast bits for drilling in mines, geothermal drilling, and a hydraulic powered jackhammer known as the Hughes Impactor. [7]

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