DETAILED NOTES ON TYPES OF SCREW HEADS

when you’re owning trouble differentiating in between Phillips and Pozidrive screws, take a look at both with the side—the latter will likely have ribs involving Just about every of the 4 arms, marked with a “pz”. One-way screws are special screws which can be turned only in a single way. They are sometimes called a single-way clutch screw