THE BASIC PRINCIPLES OF TYPES OF SCREW HEADS FOR SCREWDRIVERS

Undercut: The taper descends at a regular angle from a standard-dimensions head, but fulfills a flat base that sits along with the screw body. These screws have a head form that is definitely hexagonal and protrudes with the surface. Some types have developed-in flanges, while some have just a complete head that's in the hexagon shape.Square- 

Carriage bolts are made use of where by the looks on the concluded portion is vital, by way of example on carriage exteriors: the bolt is inserted from the skin on the section, with only The graceful head noticeable; the sq. section from the shank aligns with a sq. hole in the element, which delivers counter-rotation since the nut is tightened with