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2. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   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. Countersink cutters are manufactured with six common angles, which are 60°, 82°, 90°, 100°, 110°, or 120°, with the two most common of those being 82° and 90°.

3. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Inch-sized wood screws in the U.S. are defined by ANSI-B18.6.1-1981(R2003), while in Germany they are defined by DIN 95 (Slotted raised countersunk (oval) head wood screws), DIN 96 (Slotted round head wood screws), and DIN 97 (Slotted countersunk (flat) head wood screws). Security head screw: These screws are used for security purposes and ...

4. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   A decorative screw head with a countersunk bottom and rounded top. [40] Also known as "raised countersunk" or "instrument head" in the UK. [citation needed] Bugle head Similar to countersunk, but there is a smooth progression from the shank to the angle of the head, similar to the bell of a bugle. Cheese head Cylindrical. Fillister head

5. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Slotted countersunk head screws (with countersunk heads as specified in ISO 2009-1972) Withdrawn: DIN EN ISO 2009: ISO 2009: DIN 964: Slotted raised countersunk oval head screws: Withdrawn: DIN EN ISO 2010: ISO 2010: DIN 965: Cross recessed countersunk flat head screws: Withdrawn: DIN EN ISO 7046-1, DIN EN ISO 7046-2: ISO 7046-1, ISO 7046-2 ...

6. Self-tapping screw - Wikipedia

   en.wikipedia.org/wiki/Self-tapping_screw

   The countersunk head has a Pozidriv recess. A self-tapping screw is a screw that can tap its own hole as it is driven into the material. More narrowly, self-tapping is used only to describe a specific type of thread-cutting screw intended to produce a thread in relatively soft material or sheet materials, excluding wood screws.

7. Rivet - Wikipedia

   en.wikipedia.org/wiki/Rivet

   They are available in flat head, countersunk head, and modified flush head with standard diameters of 1/8, 5/32, and 3/16 inch. Blind rivets are made from soft aluminum alloy, steel (including stainless steel), copper, and Monel. There are also structural blind rivets, which are designed to take shear and tensile loads. [8]