Slotted Hex Washer Head self drilling screws、self tapping screws Slotted screws, head groove depth, groove width standard precision, high precision cold pier machine after molding, maintain excellent metal streamline, head bar joint chamfer (R Angle) design, to ensure the product strength and binding force. Hexagonal flange design can make screw and material perfect combination, at the same time play a certain waterproof and sealing effect Super high hexagonal head design, so that the product in use, not easy to fall off, greatly improve the construction efficiency, effectively reduce the use of products defective rate. Application: 1: Slotted Hex washer Head Self-tapping screws are also commonly called sheet metal screws, and are used for a wide variety of applications. Pre-drilling may or may not be required, depending upon the material you are installing these into 2: Slotted Hex washer Head Self-drilling screws are ideal for applications in which you need to fasten materials without pre-drilling a hole Feature: 1:Precision clamping die design, sharp and smooth knife edge, to achieve the best cutting effect 2:the product can cut tail, cutting tail can further speed up the effect of cutting 3: The thread is sharp and clear, ensuring the bite force and fast locking effect, which is more obvious in wooden materials. 4:Through the combination of equipment, mold and technology, thread error is guaranteed within 0.03mm, clear thread, smooth bottom diameter, reduce screw resistance   Website :  Stay tuned  Cheers