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2. Bolt cutter - Wikipedia

   en.wikipedia.org/wiki/Bolt_cutter

   A bolt cutter, sometimes called bolt cropper, is a tool used for cutting bolts, chains, padlocks, rebar and wire mesh. It typically has long handles and short blades, with compound hinges to maximize leverage and cutting force. A typical bolt cutter yields 20 kilonewtons (4,500 lb f) of cutting force for a 250 newtons (56 lb f) force on the ...

3. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   A cross-hole, "Weldon style" or "zero flute" countersink is a cone-shaped tool with a cutting edge provided by a hole that goes through the side of the cone. The intersection of the hole and cone form the cutting edge on the tool. The cone is not truly symmetrical as it is essential that the cone retreats away from the cutting edge as the tool ...

4. Threading (manufacturing) - Wikipedia

   en.wikipedia.org/wiki/Threading_(manufacturing)

   Threading (manufacturing) In manufacturing, threading is the process of creating a screw thread. More screw threads are produced each year than any other machine element. [ 1 ] There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and grinding, as detailed below); deformative or transformative ...

5. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   A die is used to cut or form the male portion of the mating pair (e.g. a bolt ). The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading . Both tools can be used to clean up a thread, which is called chasing. However, using an ordinary tap or die to clean threads generally ...

6. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and also as a threaded fastener . The mechanical advantage of a screw thread depends on its lead ...

7. Screw-cutting lathe - Wikipedia

   en.wikipedia.org/wiki/Screw-cutting_lathe

   A screw-cutting lathe is a machine (specifically, a lathe) capable of cutting very accurate screw threads via single-point screw-cutting, which is the process of guiding the linear motion of the tool bit in a precisely known ratio to the rotating motion of the workpiece. This is accomplished by gearing the leadscrew (which drives the tool bit's ...