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2. 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 level ...

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. 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. Directional boring - Wikipedia

   en.wikipedia.org/wiki/Directional_boring

   Directional boring, also referred to as horizontal directional drilling (HDD), is a minimal impact trenchless method of installing underground utilities such as pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground path using a surface-launched drilling rig. Directional boring offers significant ...

6. Roller cone bit - Wikipedia

   en.wikipedia.org/wiki/Roller_cone_bit

   Roller cone bit. A roller-cone bit is a drill bit used for drilling through rock that features 2 or 3 abrasive, spinning cones that break up rock and sediment as they grind against it. Roller-cone bits are typically used when drilling for oil and gas. [1] A water jet flowing through the bit washes out the rock in a slurry.

7. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   List of screw drives. At a minimum, a screw drive is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. [1][2] Usually, it also involves a mating tool, such as a screwdriver, that is used to turn it. Some of the less-common drives are classified as being "tamper-resistant".