Screw Head Shapes

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(a) pan, (b) dome (button), (c) round, (d) truss (mushroom), (e) flat (countersunk), (f) oval (raised head)[1]
Pan Head
A low disc with a rounded, high outer edge with large surface area[2]
Button or Dome Head
Cylindrical with a rounded top
Round head
A dome-shaped head used for decoration.
Mushroom or Truss Head
Lower-profile dome designed to prevent tampering
Countersunk or Flat Head
Conical, with flat outer face and tapering inner face allowing it to sink into the material. The angle of the screw is measured as the full angle of the cone.
Oval or Raised Head
A decorative screw head with a countersunk bottom and rounded top. Also known as "raised countersunk" (UK)
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 (Instrument).
Cheese Head
Disc with cylindrical outer edge, height approximately half the head diameter
Fillister Head
Cylindrical, but with a slightly convex top surface. Height to diameter ratio is larger than cheese head.
Flanged Head
A flanged head can be any of the above head styles (except the countersunk styles) with the addition of an integrated flange at the base of the head. This eliminates the need for a flat washer.

References

  1. wikipedia.org
  2. "Different Kinds of Bolt and Screw Heads", AFI, Retrieved April 26, 2016.