Product Name:self-drilling screw
　　Material:stainless steel/carbon steel.
　　Color:sliver/black/zinc
　　Standard: DIN ISO JIS GB ANSI ASME BSW
　　Grade:A2-70/A4-80/4.8/8.8/12.8
　　Package:
　　1. We have several sizes of packing dimensions, can be 20kg or 25kg per carton;
　　2. For large orders, we can design specific sizes of boxes and cartons;
　　3. Normal Packing: 1000pcs/500pcs/250pcs per small box. then small boxes into cartons.
　　4. Can provide special packings as clients requests;
　　Features:
　　1. We supply credible products with high quality in timely delivery.
　　2.All of our products are inspected by QC before packing

　　3.Standard export package or according to your requirements.

       RFQ

　　How are self drilling screws measured?
　　They are measured from the top of the head to the tip. Hex and hex washer head screws and bolts,
　　although flat on the top and the bottom, are measured from the bottom of the head. From that point
　　to the tip is the length of the screw. Self drilling screws are measured all the way to the end of the
　　drill point tip.
　　Do you need a pilot hole for self drilling screws?
　　While self-tapping screws will tap a hole into a soft material, self-drilling screws are capable of drilling
　　a hole into anything from metal to wood. This key difference is self-drilling screws have a tip like a
　　drill bit, so they do not need a pilot hole.
　　What is the difference between self drilling and self tapping screws?
　　Self-drilling screws eliminate the need for a pilot hole, but can tap as well. Self-tapping screws tap
　　their own threads, but cannot drill through metal and require a pilot hole. These screws are not
　　interchangeable, and mixing up the two can cause many headaches or possible failures in the field.
　　What are self drilling screws used for?
　　Self drilling screws have a point that acts as a drill bit and sharp cutting threads that tap the hole
　　during installation. Self drilling screws are a commonly used variety of screw for quick drilling into
　　both metal and wood. A self drilling screw can typically be identified by its point and flute (notch) tip.

Self drilling screw: self-drilling screw connect componenets in one worek step:the drill ,from the thread and fasten .

This reduces the installation time,saves tool changes and costs for drills.

Self drilling screw: self -drilling screw are availablein,stianelss steel for weather-exposed areas and in zinc,plated  steel for unweathered areas.

These steel screws hace a head encapsulated by chemical.resistant stainless steel . a rubber-bonded  washer compresses to form a,watertight seal.

The save you time,and effort by drilling theri own holes and fastening in a single operation