	Easy reference
*Head Styles*

Schematic	Head Style	Description
	Pan	Slotted pan heads have a flat or gently rounded top surface, cylindrical sides and a flat bearing surface. Phillips and Torx pan heads have a rounded top, cylindrical sides and a flat bearing surface.
	Binding Undercut	Has a rounded top surface and slightly tapered sides. The bearing surface is flat with an annular undercut adjacent to the shank.
		A countersunk head with a flat top surface and a cone-shaped bearing surface with a head angle of approximately 82 degrees.
	Flat Undercut	Similar to an 82 degree flat head except that the head is undercut to 70% of its normal side height.
		A countersunk head with a flat top surface and a cone-shaped bearing surface with a head angle of approximately 100 degrees.
	Fillister	Has a rounded top surface, cylindrical sides, and a flat bearing surface. The greater side height is what distinguishes a fillister head from a pan head.
	Indented Hex	Has an indented top surface, six flat sides, and a flat bearing surface.
	Indented Hex Washer	Has an indented top surface, six flat sides and a flat washer which projects beyond the sides and provides a flat bearing surface. The washer and hex head are formed together as one piece.
	Truss	Has a low rounded top surface with a flat bearing surface greater in area than a round-head screw of the same nominal size.
	Oval	A countersunk head with a rounded top surface and a cone-shaped bearing surface of approximately 82 degrees.
	Round	Has a semi-elliptical top surface and a flat bearing surface.