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2. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A socket cap screw, also known as a socket head capscrew, socket screw, or Allen bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole. The term socket head capscrew typically refers to a type of threaded fastener whose head diameter is nominally 1.5 times that of the screw shank diameter, with a head height equal to the ...

3. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   In Japan, the male sizes are often designated as DTC-20, DTC-27, DTC-40 (discontinued) and DTC-45 corresponding to a respective screw head size of 3.2 mm, 4.6 mm, 6.4 mm and 7.7 mm; with the size of the screw measured across the widest portion of the mating part of the head. The most common sizes in use for consumer electronics are DTC-20 and ...

4. File:Screw head types.svg - Wikipedia

   en.wikipedia.org/wiki/File:Screw_head_types.svg

   profiles of screw heads: (a) pan, (b) dome or button, (c) round, (d) truss or mushroom, (e) flat or countersunk, (f) oval or raised head: Date: 24 July 2007, 13:54: Source: Screw head types.png originally created by Wapcaplet and released under a GFDL license: Author: Vectorized version by of Sakurambo: Permission (Reusing this file)

5. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. [3]: 85–86 They also allow the use of angled screwdrivers and trim-head screws. The socket-headed Robertson screws are self-centering and reduce cam out. They also stop a power tool when set, and can be more easily ...

6. Sex bolt - Wikipedia

   en.wikipedia.org/wiki/Sex_bolt

   Thread size length and thread class fit for both barrel and screw. The more thread depth, the more difficult these parts are to manufacture, and the more expensive. Head style the most common head style for a mating fastener is a "truss" head. Other head styles are button, flat, grommet, hex head, large truss, low profile, oval, rivet and T-head.

7. File:Screw Head - 12-Spline Flange.svg - Wikipedia

   en.wikipedia.org/wiki/File:Screw_Head_-_12...

   Original file (SVG file, nominally 512 × 512 pixels, file size: 319 bytes) This is a file from the Wikimedia Commons . Information from its description page there is shown below.