Self-drilling screws are easy to distinguish if you look at their point, which curves gently at the end and is shaped like a twist drill. They’re often called Tek Screws, after the brand name that popularized them.

screws are processed through cold forging to strengthen the tooth pattern throughout the entire process, maintaining the unique corrosion resistance characteristics of each stainless steel without any heat treatment. They are smoothly screwed into the tooth pattern in a stable and non-destructive manner, achieving excellent performance in tightening the structure against pulling and wind stripping.
The screw surface is protected by a baked ceramic layer and a galvanized layer, coupled with 304 stainless steel+EPDM one-piece gasket to isolate water vapor, prevent electrochemical corrosion, and ensure the safety of fixation with carbon steel purlins
EPDM washer is a sealing gasket typically made of EPDM (ethylene propylene rubber) material. EPDM is a high performance rubber with good weather resistance, corrosion resistance and aging resistance.
The appearance of EPDM washers is usually circular or square, with a central hole and a circular edge. They can be customized in various sizes and thicknesses to meet specific application requirements. The main function of EPDM washers is to provide sealing to prevent water, gas, dust, and other particles from entering the connection, thereby preventing water, gas, and corrosion

Poduct Application:a
1. Apply to metal plate, galvanized steel plate, metal curtain wall, metal light compartment, aluminum
door and window, indoor and outdoor decoration.
2. General anglesteel, channel steel, iron plate, PC Board and other metal material combining
installation.
3. Suitable for assembling steel roof, automobile body, container, shipbuilding industry, freezing
equipment and so on.

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;

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 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