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2. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   Side and end view of a 4-fluted countersink. The fluted countersink cutter is used to provide a heavy chamfer in the entrance to a drilled hole. This may be required to allow the correct seating for a countersunk-head screw or to provide the lead in for a second machining operation such as tapping.

3. Counterbore - Wikipedia

   en.wikipedia.org/wiki/Counterbore

   Comparison of countersunk and counterbored holes. Counterbore cutter marked 'E. A counterbore hole is usually used when the head of a fastener, such as a hex head or socket head capscrew, is required to be flush with or below the level of a workpiece's surface.

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   The recess in the mating part must be designed to accept the particular plow bolt. ASME B18.9 standard recommends a No. 3 head (round countersunk head square neck) plow bolts and No. 7 head (round countersunk reverse key head) plow bolts for new designs. The necessary dimensions for the head styles can be found in the standard. [13] [14] [15]

5. Self-tapping screw - Wikipedia

   en.wikipedia.org/wiki/Self-tapping_screw

   Self-tapping screws can be divided into two classes: [3] those that displace material (especially plastic and thin metal sheets) without removing it, known as "thread-forming" self-tapping screws, and self-tappers with sharp cutting surfaces that remove the material as they are inserted, termed "thread-cutting" self-tapping screws.

6. Fastenal - Wikipedia

   en.wikipedia.org/wiki/Fastenal

   2018 Bolt Award winning branch located in Quakertown, PA. Fastenal first sold mostly fasteners such as screws, threaded rods, and nuts, which are used in construction and manufacturing. [6] Today's product range is more diverse, and the company had a total of 690,000 individual products as of 2010. [5]

7. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   Hanger bolt - Bolt that has no head, machine threaded body followed by a wood threaded screw tip. Allow nuts to be attached to what is really a screw. Hex bolt - Bolt with a hexagonal head and threaded shank. Section immediately under head may be unthreaded for fastening thicker materials. J bolt - Bolt shaped like the letter J, used for tie downs.