Comprehensive Guidance from Design to Practice
With the increasing application of engineering plastics in industrial manufacturing, how to efficiently and safely connect plastic components has become an important technical challenge. Engineering plastics have been widely used in automotive, electronic devices, consumer goods, and other fields due to their light weight, high strength, and excellent processability.
The connection of plastic components usually relies on fasteners. Today, we will introduce a commonly used fastener connection method - self-tapping screws.
Special Self-Tapping Screws for Plastic Parts
Cross/Trox/Pan head/Countersunk head/with Collar
Material: A2 stainless steel, low carbon steel
Specifications: M2-M6
Surface treatment: Environmentally friendly blue-white zinc, environmentally friendly black zinc, black zinc-nickel alloy, plain
1. Product Display of Special Self-Tapping Screws for Engineering Plastics
Plastic tooth self-tapping screws are fasteners specially designed for plastic workpieces, which can be directly screwed into plastic materials to achieve a firm connection. This self-tapping screw has multiple advantages, making it an ideal choice for connecting plastic workpieces.
Optional materials and surface treatment processes:
| Material | Code | Remarks |
|---|---|---|
| Low carbon steel | CS | Hardness: HV320-380 |
| A2 stainless steel | A2 | Strength: A2-50 |
| Base material | Surface treatment | Code |
|---|---|---|
| Low carbon steel | Electroplated blue-white zinc | ZU |
| Low carbon steel | Electroplated black zinc | ZB |
| Low carbon steel | Electroplated black zinc-nickel alloy | ZNB |
| A2 stainless steel | Natural color | / |
2. Characteristics and Advantages of Special Self-Tapping Screws
ordinary self-tapping screws and special self-tapping screws
a. Tooth profile angle 30°
- Smaller radial tension, the hole is not easy to crack
- Allows thinner wall thickness
- Reduces screw backtracking caused by loosening during screw use
b. Optimal thread pitch
- Deepens thread engagement and improves the pull-out force of the screw
- Balances the load ratio between the screw and the workpiece
c. Double bottom diameter provides good plastic flow
- Larger installation torque range
- Higher clamping force
- Higher torsional resistance
3. Principles and Importance of Drilling Design for Plastic Parts
Using self-tapping screws to connect plastic parts requires pre-drilling holes in the parts, and the rationality of the drilling design directly affects the fastening effect. Designing efficient and durable drilling and fastening solutions for these materials can not only improve the stability of the connection but also extend the service life of the product.
a. Aperture design
The aperture (dh) should maintain an optimal ratio with the screw diameter (d). For example, for conventional plastic materials, the recommended aperture is dh=0.8×d±tolerance. For high-filled or high-strength materials, the aperture can be adjusted to dh=0.88×d to prevent cracking or deformation.
b. Guide hole setting
Setting a guide hole on the workpiece surface can effectively prevent damage to the workpiece surface, help align the screw with the hole, and improve the reliability of repeated installation. The recommended diameter of the guide hole is d+0.2mm, and the depth is 0.5d.
Through reasonable drilling design, the reliability of plastic part connection and the performance of fasteners can be significantly improved.
4. Drilling Solutions for Plastic Workpieces
According to the characteristics of plastic materials, the recommended drilling parameters are as follows (for reference):
Reference comparison table for self-tapping screws and drilling for plastic connections
5. Summary of Advantages of Special Self-Tapping Screws for Plastic Parts
- Precise positioning: Designed for plastic parts, self-tapping screws have higher positioning accuracy and support flexible selection of various workpiece materials to meet different scenario needs.
- Excellent locking performance: Compared with ordinary self-tapping screws, it performs better in assembly effects. The locking process is faster, and it can achieve stable locking of workpieces with lower torque, improving work efficiency.
- Convenient selection reference: Provides detailed technical parameters such as drilling size and installation torque, which is convenient for customers to make precise selection in the design stage to ensure adaptability and efficiency in use.
- Diversified product types: Diversified product types, providing 6 different head designs, far exceeding the countersunk head and pan head options in the national standard, meeting more application needs.
- Excellent product quality: The product has excellent surface corrosion resistance (such as good salt spray test results), complete varieties, meets environmental protection requirements, and is reliable in quality. Samples can be provided to customers at any time for testing and verification.
- Perfect after-sales service: Equipped with professional testing equipment, providing customers with comprehensive technical support, quickly solving installation or application problems during use, ensuring that customers have no worries.
Looking to the Future · Moving Forward Together
With the expansion of plastic application fields, future drilling solutions will become more intelligent and refined. Through simulation technology and AI optimized design, engineers can predict the behavior of fasteners and materials in the design stage, providing higher reliability and efficiency for products.
If you have more needs for self-tapping screw drilling design or fastener selection, please contact us to obtain professional support.
