there are actually far more heads that are available, but all are a variation or blend of these pursuing basic designs: The hex push enables using sockets and spanners for tightening and loosening the screw (or bolt). You will find a substantial Get in touch with surface spot so massive amounts of pressure could be applied The threads of a screw

With this class there are a few screws which call for precise variety of screwdriver for their set up. Pan Washer Head. This head kind is a mix of a screw plus a washer. The pinnacle can be circular or hexed, and has a washer built onto the head to improve its diameter, prevent overdriving into softwoods, whilst giving a optimum bearing surface.