THE ULTIMATE GUIDE TO TYPES OF SCREW HEADS WITH PICTURES

Hi-Lo (or Superior-Lower) threads are twin screw threads, but where by among the list of threads is decrease than another. The reasoning is to provide a screw with the Chunk and travel speed of a twin thread but which is less likely to split the fabric which is staying screwed.Socket cap screws Use a cylindrical head with a hexagonal drive hole. Th