Stainless Steel Countersunk Head Inner Square Self-Tapping Screws

Product introduction

This product is a high-performance fastener, made of high-quality stainless steel, with excellent rust and corrosion resistance, and is suitable for various harsh environments. Its core feature is the square hole embedded in the head, which can withstand greater torque, effectively prevent the screwdriver from slipping during tightening, and make the connection stronger and more reliable. The countersunk head design allows the screw head to completely sink into the workpiece surface, achieving a flat and smooth installation effect. Combined with self-tapping threads, no pre-tapping is required. It can be drilled and screwed directly into materials such as wood and thin metal plates, making installation convenient and efficient. It is widely used in fastening occasions that require high strength and high weather resistance, such as building curtain walls, mechanical equipment and outdoor facilities.

 

Product features

1. Excellent corrosion resistance: Made of high-quality stainless steel such as 304 or 316, it has strong anti-rust and anti-corrosion capabilities, can adapt to harsh environments such as moisture and chemical media, and has a long service life.

2. Powerful anti-twisting performance (inner square drive): The interior adopts a square hole design, which closely matches the special wrench, has a large contact area, and can withstand extremely high tightening torque. It effectively avoids the problems of slipping and twisting of the cross groove, making the installation more reliable, and is especially suitable for high-strength fastening and automated production.

3. Flat installation interface (countersunk head design): The tapered head design can completely sink under the surface of the workpiece after tightening without protruding, ensuring the flatness and beauty of the installation surface and avoiding interference.

4. Convenient self-tapping ability: the tail is self-tapping thread and the tip is sharp. When used on materials such as wood, thin steel plates, aluminum profiles, plastics, etc., there is no need to pre-tap and can be directly drilled and screwed in, which greatly improves assembly efficiency and saves processing steps.

5. High-strength connection: The stainless steel material provides good mechanical strength. Combined with the sufficient tightening ensured by the inner four-way drive, it can form a strong and reliable fastening connection, effectively resisting vibration and loosening.

 

Product application

1. Construction and curtain wall industry: used to fix aluminum alloy doors and windows, glass curtain wall press blocks, metal plate curtain walls, etc. Its weather resistance can ensure the safety and beauty of long-term use.

2. Outdoor facilities and structures: widely used in guardrails, billboards, air conditioner outdoor unit brackets, metal roofs and lighting panel fixings, etc., and can effectively resist wind and rain erosion.

3. Mechanical equipment and rail transit: suitable for the installation of equipment shells, protective covers, wire trough covers, and the fastening of components inside the vehicle. The inner square design can withstand vibration and prevent loosening.

4. High-end metal furniture and display racks: used to assemble shelves, metal tables and cabinets, display cabinets, etc. The countersunk head design keeps the furniture surface smooth and beautiful, and the stainless steel material is easy to clean.

 

FAQ

Q: What material is this screw mainly made of? What is the difference between 304 and 316, and how should I choose?

A: This product mainly uses austenitic stainless steel, and the common grades are 304 and 316. 304 stainless steel: highly versatile, with good rust and corrosion resistance, suitable for most daily environments and ordinary industrial environments (such as indoors, dry, and outdoors without serious pollution). 316 stainless steel: Contains molybdenum, and its chloride corrosion resistance is significantly better than 304. It is very suitable for harsh occasions such as coastal areas, around chemical plants, and salt spray environments.

 

Q: Is pre-tapping required during installation?

A: No need. This is the embodiment of the "self-attack" function. It can squeeze and cut materials by its own threads in suitable pre-made holes (such as drilled holes) to form internal threads, thereby completing fastening, eliminating the need for pre-tapping steps, and is extremely efficient.

 

Q: What are the advantages of the "internal four-party" drive? What tools do I need to install?

A: Its main advantages are high torque and anti-skid. Advantages: The square drive structure provides a larger contact area and can transmit much larger torque than cross recess and slot. It effectively prevents the screwdriver head from slipping out and damaging the screws, ensuring the reliability of the connection and the efficiency of installation. Tools: You will need to use a matching square box wrench, often called an "Allen key" or "Allen wrench." Be sure to make sure the wrench fits perfectly into the screw hole before applying torque.

 

Q: What are the special requirements for the mounting holes of the countersunk head design?

A: On request. In order to ensure that the screw head sinks perfectly under the surface of the workpiece for a flat installation, you need to pre-machine a corresponding 90-degree countersunk hole for the conical head of the screw. If the angle or depth of the countersunk hole is inappropriate, it will cause the screw head to protrude or not be tightened tightly.

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