The plum blossom groove half tooth bolt self tapping screw is a fastener that combines various structural characteristics. The following provides a detailed explanation from the aspects of structure, working principle, and application:
Structural characteristics
• Head:
Featuring an innovative plum blossom or star-shaped groove design, this screw head boasts 6 or more meticulously arranged symmetrical teeth. This ensures a snug fit with the proprietary plum blossom screwdriver, allowing for optimal force distribution and minimizing slippage. Options include pan head, countersunk head, or semi-countersunk head. To enhance durability and resistance to corrosion, the surface can be treated with galvanizing or blackening.
• Screw:
Half tooth design: A sophisticated construction where half of the screw is elegantly threaded while the other half remains a smooth rod. This allows the bare rod to glide effortlessly through the component's hole, while the threaded segment performs its self-tapping magic into the substrate, securing one side tightly while fastening the other securely.
Thread: Designed for self-tapping, the thread features an exceptionally sharp tooth profile, expansive pitch, and impressive depth, making it a breeze to form internal threads in soft materials—be it wood, plastic, or light metals—without the need for pre-drilling, apart from some basic bottom hole preparation.
• Size specifications:
These screws come in a versatile range of diameters, usually between 2-8mm, and lengths spanning from 6mm to 100mm. The proportion of the half-tooth segment versus the smooth rod can be customized to meet specific needs, allowing for configurations such as a half-tooth segment taking up 1/2 or even 2/3 of the screw's entire length.
Working principle
1. Self tapping and cutting: Ingeniously designed sharp threads rotate and slice into softer materials, using the art of thread compression and cutting to create precisely matched internal threads for secure fastening.
2. Half tooth positioning: The smooth rod segment seamlessly glides through the through-hole of the connected component, providing precise positioning and guidance, thereby averting any risk of screw tilt. Meanwhile, the threaded segment anchors itself in the substrate, enhancing the overall stability and security of the connection.
3. Advantages of plum blossom groove: Compared with straight or cross grooves, the plum blossom groove is engineered to endure greater torque. The screwdriver remains steadfast without slipping, especially vital in high-strength fastening scenarios.
Application scenarios
Furniture and decoration: Perfect for piecing together wooden boards—like wardrobes, tables, and chairs—with the smooth rod passing neatly through panels and the threaded part embedding in the back panel, ensuring precise alignment and robust connection. It's an ideal choice for gypsum board and PVC board as well.
Electronic products and home appliances: During the assembly of plastic and thin metal casings, the half tooth design prevents thread penetration, safeguarding internal components while the plum blossom groove minimizes slipping risks when securing—perfect for routers and small appliance casings.
Light industry and DIY scenarios: Facilitates the rapid assembly of toys, models, and simple metal frames without the hassle of pre-drilling. Easy operation makes it suitable for projects that prioritize efficient installation over precision.
advantages and disadvantages
• Advantages:
The plum blossom groove shines with its exceptional anti-slip capability, allowing for higher torque application and thus delivering more reliable fastening.
The half tooth design cleverly merges positioning with self-tapping, making it ideal for multilayer material connections while mitigating any risk of penetration damage.
The self-tapping characteristic removes the need for pre-threading, enhancing installation efficiency, especially when working with softer materials.
• Disadvantages:
Its self-tapping prowess is somewhat limited in hard materials, such as thick steel plates, where pre-drilling or the use of machine screws might be necessary.
The plum blossom groove requires a dedicated screwdriver, which means its tool versatility is slightly compromised compared to more universal cross-groove or straight-groove screws.
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