NOT KNOWN FACTUAL STATEMENTS ABOUT TYPES OF SCREW HEADS

A slotted screw head was the primary sort of screw heads to become designed. it had been The most affordable to help make and was easy. Because the geometry just isn't recessed and comprises merely two stacked plain milling slots, a double-slotted screw drive will not be considered to be cruciform. In ISO 4757, Cross recesses for screws, several o