Individual refers to the pointed, coarse, hard wood screws, but also for the aluminum alloy, plastic. For metal hole screw thread of a special self-tapping screws are called silk attack. Self tapping screw used for non...

Self tapping screw surface treatment through a certain process on the workpiece surface to form a layer of corrosion resistance but also beautiful appearance of covering layer. Surface treatment can have several kinds met...

Self tapping screw although has been used for a long time, the general also know how to make, but about the norms are rules specifications and requirements, may not be very clear, here only to the specification by collect...