High Strength Plastic Screws Selection Guide

Plastic screws (plastic screws), also known as plastic screws, commonly used in the plastic screws for thermosoluble injection molding, according to the main material: nylon Pa66 screws, PP screws, PVC screws PE screws, etc., the characteristics of the material is different, so the scope of application is also different.

Plastic screws (plastic screws), also known as plastic screws, commonly used in domestic plastic screws are made of nylon 66 (NYLON66), so you can also call nylon screws.

According to the material points

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

According to the type of screw head

According to the shape of the head can be divided into: pan head plastic screws, countersunk plastic screws, hexagonal plastic screws, hexagonal plastic screws, plastic set screws and so on.

According to the shape of the groove can be divided into: cross, a word (slotted), hexagonal, meters, plum blossom, etc.

According to the specification of screw thread

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

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

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

The most important physical performance indicators:

1. Torsion resistance of the head in combination with the screw.

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

3. The outer diameter, middle diameter and bottom diameter of the threads of plastic screws are standardized. This standard is not as strict as that of metal screws due to the water absorption of different plastics, which leads to differences in dimensions under different conditions of use.

The most important chemical performance indicators

1. Acid resistance

2. Alkali resistance

3. Fire resistance

4. Insulation properties

Advantages:

1. Compared with ordinary metal screws, the biggest advantage of plastic screws is that he has good insulating properties, non-conductive.

2. In addition, because of non-metallic manufacturing, in the current or other electrical signals under the influence of eddy currents and other signal interference, its anti-interference a little suitable for communication and other industries. 3. Plastic screws acid and alkali resistance is better, which is the best PVDF screws followed by Polypropylene, both have strong acid and alkali resistance, and nylon screws compared to the first two, resistance to strong acid and alkali performance is relatively poor, so in some of the electroplating industry of strong acid and alkali environments, plastic screws, especially PVDF screws have a very wide range of applications.

Disadvantages:

1. The biggest defect of plastic screws is that ordinary plastic screws torque and strength is not as good as ordinary metal screws, torque is too large there is slippery teeth or head fracture possibility.

2. Due to different plastic molding shrinkage reasons, temperature and humidity changes as well as the length of the molding cycle and other reasons lead to plastic screws size error tolerance. In addition, due to the soft material of ordinary plastic, can not use the conventional ring gauge measurement method.

Fields of application

Plastic screws have insulation, non-magnetic, corrosion-resistant, beautiful, never rust and other high-quality characteristics, and modified engineering plastics, its use of strength, impact resistance and metal comparable to the plastic screws we often say is commonly known as nylon screws added 30% glass fiber, its mechanical properties are far superior to the ordinary nylon, plastic screws using a diverse range of materials, performance continues to improve, and the application of areas are also becoming more and more broad.

1, Medical equipment industry (insulation, non-magnetic, environmental protection, anti-interference signal, so that the use of medical machinery and equipment safer)

2, Wind power industry (chassis circuit PCB board isolation, insulation)

3, Aerospace industry (electronic equipment insulation, anti-interference signal)

4, Office equipment industry (never rust, beautiful and practical)

5, Petrochemical industry (high temperature, chemical and corrosion resistance, to extend the life of equipment)

6, Electronics industry (insulation, anti-interference, light weight)

7, Communications industry (insulation, non-magnetic, safety)

8, The marine industry (acid, alkali and corrosion resistance, to extend the service life) and so on...

The specifications of plastic screws, complete size to meet the needs of different occasions.

High Strength Plastic Screws Selection Guide

In the choice of plastic screws, the most important thing is to consider the application of special scenes, for example, strength, corrosion resistance, conductive insulation environment and plastic materials and other materials will have what interaction. Specific size requirements, clear these issues, in choosing the right plastic screws is half the effort.

1.Plastic screws do not rust, metal corrodes and rusts in wet environments, which over time reduces the strength of the fastener, plastic screws do not, for example, like PVDF screws, PTFE screws have excellent resistance to acids and alkalis.

2.Plastic screws are more able to withstand the damaging effects of ultraviolet light than metal, and when using plastic screws in marine applications, it is also necessary to use plastic screws that do not absorb UV energy to avoid free radicals that accelerate corrosion in the material.

3. Plastic screws also have comparable to the strength of metal screws, and the quality of only 30% of the latter, very suitable for lightweight mechanical parts of the weight ratio, in the base resin to add glass fibers or other metal fillers, but also to further enhance the overall strength of plastic screws, and stiffness.

4. Plastic screws have the role of cost reduction and efficiency, cheaper than metal screws, the cost savings can be used in other areas of gain.

PVDF screws - with excellent acid and alkali resistance characteristics, very suitable for strong acid and alkali corrosive environment to replace the use of metal screws

Nylon PA66 screws - is currently one of the most widely used plastic screws, with high strength and wear resistance.

PEEK screws - light weight, high temperature resistance, excellent electrical properties, radiation resistance, can be used as high-performance fasteners for the nuclear industry.

PTFE screws - with excellent wear resistance, flexibility, very high anti-rising strength and impact strength.

RENY screws - is a thermoplastic engineering plastics, with excellent tensile strength, bending strength, fatigue resistance, creep properties. Has strength comparable to aluminum-zinc alloy, but only 20% of the mass of iron.

Tensile break (N) for different plastic