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2. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   A tap is used to cut or form the female portion of the mating pair (e.g. a nut ). 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 ...

3. 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 ...

4. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   Drill bit. From top: Spade, brad point, masonry, and twist drills bits. Drill bit (upper left), mounted on a pistol-grip electric drill. A set of masonry drills. A drill bit is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create ...

5. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   Cross-hole countersink cutter. 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 ...

6. Square thread form - Wikipedia

   en.wikipedia.org/wiki/Square_thread_form

   The greatest disadvantage is the difficulty in machining such a thread. The single-point cutting tools or taps and dies used to cut the thread cannot have efficient rake and relief angles (because of the square form), which makes the cutting slow and difficult. Square threads also cannot carry as much load as a trapezoidal thread, because the ...

7. Counterbore - Wikipedia

   en.wikipedia.org/wiki/Counterbore

   A counterbore in a metal plate. In machining, a counterbore ( symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature. A counterbore hole is typically used when a fastener, such as a socket head cap screw or fillister head screw, is required to sit flush with or below the ...