Self-Drilling Screws, also known as self-tapping and self-drilling screws, are special fasteners with a built-in drilling function at the front end. They do not require pre-drilling and can complete drilling, tapping, and fastening in one operation on steel plates, steel parts, or other plates, greatly improving assembly efficiency. They are widely used in construction steel structures, color steel roofs, mechanical equipment, and shelf installation, among other fields.
Self-drilling screws: Industrial power tools for efficient self-tapping fastening
The main standards for self-drilling screws include GB15856, DIN7504, ISO1548, JIS1124, and American standards, etc. The head types commonly involved include hex flange heads, pan heads, countersunk heads, semi-countersunk heads, etc. In addition to the standards, there are also commonly used head types such as wafer heads and waffle heads.
I. Materials for self-drilling screws:
1. Carbon steel: 1022, 435, etc.
2. Martensitic stainless steel: 410, 420, 550, etc.
3. Stainless steel: 304, 316, etc.
4. Composite materials: 304/316 + 410/1022/435
II. Which industries commonly use self-drilling screws?
The curtain wall industry mainly uses ST4.2 and ST4.8 pan heads and countersunk heads, and ST5.5 hex flange heads.
The steel structure industry mainly uses ST5.5 and ST6.3 hex flange heads.
The door and window industry mainly uses ST4.2 and ST4.8 pan heads and countersunk heads.
The photovoltaic industry mainly uses ST6.3 hex flange heads.
The guardrail industry mainly uses ST5.5 wafer heads.
III. Problems encountered during the use of self-drilling screws and their causes:
1. 410 rusts in high-corrosion environments such as the seaside?
410 is a martensitic stainless steel with poor corrosion resistance in its natural state. It needs to be passivated or undergo other surface treatments to achieve better corrosion resistance.
2. Self-drilling screws cannot be driven into the plate?
a. The wrong material of self-drilling screws was selected, such as using 304/316 self-drilling screws to drill and tap iron plates or stainless steel plates.
b. The plate is too thick, exceeding the drilling and tapping range of the self-drilling screw.
c. Drilling and tapping a stainless steel plate.
3. Self-drilling screws break?
a. The wrong hand drill was selected (a hand drill with a power of 350-500W should not be used in impact mode).
b. The installation was not vertical (perpendicular to the surface of the profiled steel plate and apply force to create a center point, speed: 1000-1500 rpm).
c. The drill did not slow down when reaching the bottom.
d. The selected self-drilling screw size is unreasonable.
e. The self-drilling screw has quality issues.
Summary
Self-drilling screws, with their integrated advantages of self-drilling, self-tapping, and self-locking, have become an indispensable efficient fastening solution in modern industrial assembly. When choosing, the following points should be focused on:
1. Type and thickness of the target plate – determine the required material and tail number.
2. Corrosion resistance requirements – choose stainless steel or appropriate surface treatment.
3. Strength and efficiency requirements – pay attention to specification parameters (ST number, flange size) and product performance (such as drilling and tapping speed).
4. Special applications – fully utilize the customization capabilities of suppliers (material composites, ultra-thick plates, special head types/coatings).
With the advancement of materials science and manufacturing processes, self-drilling screws are evolving towards higher strength, better corrosion resistance, greater intelligence (such as optimizing with electric tools), and greater environmental friendliness, continuously providing more reliable and efficient fastening solutions for various industries.
If you are looking for self-drilling screws, please visit us here https://hktl-fastener.com/screws/.
