NOT KNOWN FACTUAL STATEMENTS ABOUT TYPES OF SCREW HEADS

Furthermore, it makes it possible for an increased torque force than other screw heads. The frearson screw is Employed in marine hardware. generally known as pig nose or twin hole, this screw head has two spherical holes that happen to be reverse one another and resemble a pig’s nose. It is a stability-model screw to stop tampering. you may need