What Is a Plastic Screw?

Plastic screws (also known as plastic screws). Plastic screws commonly used in China are made by hot melt injection molding. They are divided according to the main materials: nylon PA66 screws, PP screws, PVC screws and PE screws. Each material has different characteristics, so There are also differences in the scope of application.

Plastic screw

Plastic screws, also known as plastic screws, are commonly made of nylon 66 (NYLON66), so they can also be called nylon screws.

Since the large-scale application of plastic products in industry and daily life in the 1970s, plastic products have become a relatively important branch of the petrochemical industry and have been used in many application fields. Compared with traditional metal screws, plastic screws have excellent performance in many aspects.

By material

Nylon screws, PC screws, PVDF screws, PP screws, PTFE screws, etc.

Divided by screw head type

According to the shape of the head, it can be divided into: pan head plastic screws, countersunk head plastic screws, outer hexagon plastic screws, inner hexagon plastic screws, plastic set screws, etc.

According to the shape of the slot, it can be divided into: cross, slotted (slotted), hexagon, rice, plum, etc.

Divided by screw specifications

Metric thread M2, M2.5, M3, M4, M5, M6, M8, M10, M12

American screw teeth 2-56, 4-40, 6-32, 8-32, 10-32

According to the above classification, many different types of plastic screws can be combined.

The most important physical performance indicators:

1.Head and screw joint torsion resistant

2. Whether the head groove, especially the cross head, fits the standard head size of a screwdriver.

3. The external diameter, middle diameter and bottom diameter of plastic screws are standardized. Because the water absorption of different plastics results in dimensional differences in different environments, this standard is not as strict as metal screws.

The most important chemical performance indicators

Acid resistance

2. Alkali resistance

3.Fire rating

4. Insulation performance

1. Compared with ordinary metal screws, the biggest advantage of plastic screws is that they have good insulation properties and are not conductive.

2. In addition, because of non-metal manufacturing, there will be no signal interference such as eddy current under the influence of current or other electrical signals, and its anti-interference is a bit suitable for industries such as communications. 3. Plastic screws have better resistance to acid and alkali. The best PVDF screws are followed by polypropylene. Both have strong resistance to acid and alkali. Nylon screws are more resistant to acid and alkali than the previous two. The performance is relatively poor, so in the strong acid and alkali environment of some electroplating industries, plastic screws, especially PVDF screws, are widely used.

1. The biggest defect of plastic screws is that the torque and strength of ordinary plastic screws are not as good as those of ordinary metal screws. If the torque is too large, there may be sliding teeth or head breakage.

2. Due to shrinkage of different plastic molding, temperature and humidity changes, and the length of the molding cycle, the dimensional error of plastic screws is allowed to be large. In addition, because the material of ordinary plastic is relatively soft, the conventional ring gauge measurement method cannot be used.

Plastic screws have high-quality properties such as insulation, non-magnetic, corrosion resistance, beautiful appearance, and never rust. Modified engineering plastics have comparable strength and impact resistance to metals. We often say that plastic screws are commonly called nylon screws. After 30% glass fiber, its mechanical properties are far superior to ordinary nylon. The materials used for plastic screws are becoming more diverse, the performance is continuously improved, and the application field is becoming wider and wider.
1. Medical equipment industry (insulation, non-magnetic, environmental protection, anti-interference signal, making medical machinery and equipment safer to use)
2. Wind power industry (Isolation and insulation of chassis circuit PCB board)
3. Aerospace industry (insulation and anti-interference signals on electronic equipment)
4. Office equipment industry (never rust, beautiful and practical)
5. Petrochemical industry (high temperature resistance, chemical resistance, corrosion resistance, extended equipment life)
6. Electronics industry (insulation, anti-interference, light weight)
7. Communication industry (insulation, non-magnetic, safety)
8. Shipbuilding industry (acid, alkali, corrosion resistance, extended service life), etc ...
The specifications and sizes of plastic screws meet the needs of different occasions.