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2. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   Twist drill bits are available in standard lengths, referred to as Stub-length or Screw-Machine-length (short), the extremely common Jobber-length (medium), and Taper-length or Long-Series (long). Most drill bits for consumer use have straight shanks. For heavy duty drilling in industry, bits with tapered shanks are sometimes used. Other types ...

3. Counterbore - Wikipedia

   en.wikipedia.org/wiki/Counterbore

   The smaller top item is an insert, the middle shows another three-fluted counterbore insert, assembled in the holder. The shank of this holder is a Morse taper, although there are other machine tapers that are used in the industry. The lower counterbore is designed to fit into a drill chuck, and being smaller, is economical to make as one piece.

4. Drill bit shank - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_shank

   Small (about 1 ⁄ 4 inch or 6.4 millimetres diameter) threaded drill bits and countersinks are common in aircraft metal work. Threaded drill bits may be held in drills meant to reach into very tight spaces, and threaded countersink cutters are widely used (along with finely adjustable depth stops) to create holes which put a matching rivet ...

5. Parallel (engineering) - Wikipedia

   en.wikipedia.org/wiki/Parallel_(engineering)

   They come in a variety of thicknesses and size, allowing them to be stacked up or to support a workpiece which doesn't have a flat profile. Parallels commonly have a series of holes drilled on the 'front' face - allowing them to be used to position a workpiece or secured using t-slot clamps, and a countersink on each side to remove any sharp edges.

6. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   In manufacturing, a countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt , screw or rivet , when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counterbore makes a flat ...

7. Fuller (groove) - Wikipedia

   en.wikipedia.org/wiki/Fuller_(groove)

   As a blacksmithing tool, a fuller is a type of swage, a tool with a cylindrical or beveled face used to imprint grooves into metal. Fullers are typically three to six inches long. If a groove is to be applied to both sides of the steel, two fullers may be used at the same time, sandwiching the workpiece in the middle.