A REVIEW OF TYPES OF SCREW HEADS

they offer a lot more security into the utilized pressure compared to the Phillips screws. The difference between a Phillips screw plus a posidriv may be determined by searching them from side. you will find ribs between all the four arms from the posidriv and they are marked by ‘pz’. These screws are usually often known as Robertson’s. they

The extremely-Lok, and Ultra-Lok II are some of these layouts that use custom keyed drivers, which tend to be confined to industrial and institutional makes use of that are unavailable to the average layperson. vital-Rex screws are A different style, and are used in this sort of issues as ballot boxes and financial institution vaults.[forty] Spong