drive Hot Dip Galvanized Hex Head Roofing Self Drilling Screw and Washer

Description

The properties of drilling screw : 1) Exact forging standard of knife edge and high hardness of surface make it easy to drill. 2). The Special technology treatment of the surface makes the product anti-corrosion , antirust and durable. 3) Using the advanced technology to control the core hardness, avoiding rupture effectivity,

Hex Washer (Unslotted) Head Self Drilling Screws (Zinc-Plated Steel) are designed for use in metal applications. Like self tapping screws, self drilling screws cut threads while being installed. A self drilling screw, however, has a notched point that acts as a drill point and therefore does not require a pre-drilled hole before installing. The generic name for these screws are Self Drilling,

Specification

Production Process 

1.Wire Drawing Production Process

Coiling -Roughing-Spheroidizing-Purifying- Finished Product Wire

Wire drawing : pulling the raw wire till the diameter we need.

2.Screw Molding

 Heading - threading

3. Heat treatment-Electroplating-packing