What Is a Round Head Screw?

Round head screws have a slot shape and a head shape. After installation, the head of the semicircular screw is exposed on the mounting surface.

Round head screw

The main plastic material of the round head screw is nylon 6/6.

PA66 [nylon 66]

PA66 (polyamide 66 = nylon 66) is a crystalline engineering plastic. It is a high-toughness material with a low coefficient of friction, abrasion resistance, and excellent self-lubricating properties. Its oil resistance and chemical resistance are also very good, so it is most suitable for use as a mechanical material, but there is also a problem that because of its high hygroscopicity, it must be considered in the design. Water as a plasticizer reduces the tensile strength of nylon. Tensile strength, air permeability, and improved ductility, impact strength, and energy absorption characteristics. By adding carbon black during injection molding, the outdoor weatherability of nylon can be improved. Under most operating conditions up to 85 ° C, nylon products Can still work normally for a long time. The color of the nylon material is translucent off-white.
· Does not contain 6 substances restricted by RoHS directive (lead, cadmium, mercury, hexavalent chromium, PBB, PBDE)
· Continuous use temperature: 85
Flammability UL94 V-2
Improved impact resistant nylon 66
Improved impact resistant nylon 66 has the additional advantage of strong impact resistance under low temperature conditions, and its heat resistance is far better than ordinary nylon 66. The color of the modified impact resistant nylon 66 is off-white.
Add 30% glass fiber nylon 66
Nylon 66 with 30% glass fiber has outstanding mechanical properties far superior to ordinary nylon 66. Compared with ordinary nylon 66, the following aspects have been improved: increased tensile strength, deformation temperature and shear strength, improved creep resistance, dimensional stability, and reduced water absorption and thermal expansion. 30% glass fiber-containing nylon 66 has good abrasion resistance, and the related electrical properties and low coefficient of friction of nylon 66 have been retained. The color of nylon 66 with 30% glass fiber is opaque tan.

Picture comparison of various head shapes of screws. Cylindrical head. Half head. Sink down. Spherical cylindrical head. Pan head. Round head. Hex Head.

Round head plastic screws have high-quality properties such as insulation, non-magnetic, corrosion resistance, beautiful appearance, and never rust. Modified engineering plastics have comparable strength to impact strength and metal. We often say that plastic screws are commonly called nylon After adding 30% glass fiber to the screw, its mechanical properties are far superior to ordinary nylon. The materials used for round-head plastic screws are becoming more diverse, their performance is constantly improving, and their application fields are becoming wider and wider.
1. Medical equipment industry (insulation, non-magnetic, environmental protection, anti-interference, making medical machinery and equipment safer to use)
2. Wind power industry (Isolation and insulation of chassis circuit PCB board)
3. Aerospace industry (insulation, anti-interference number 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 round-head plastic screws meet the needs of different occasions.