Introduction to standard sizes of self-tapping screws
The self-tapping screw is a self-tapping screw with a diamond-shaped head, mostly used in wood products and gypsum boards. There are many types and specifications, and the commonly used sizes are as follows:
1. Diameter: The diameter of the self-tapping screw is usually 3.5mm, 4.2mm, 4.8mm, 5.5mm, etc., among which the self-tapping screws with diameters of 4.2mm and 4.8mm are the most common sizes.
2. Length: The length of the self-tapping screw is generally from 16mm to 150mm, calculated in millimeters, and the length changes every 5mm. Self-tapping screws of different lengths are suitable for different scenarios. The shorter length is suitable for thin wood boards, gypsum boards, etc., and the longer length is suitable for reinforcing wood structures, etc.
Thread type: The thread of the self-tapping screw is divided into full thread and half thread according to the use scenario. Full thread is suitable for hardwood, and half thread is suitable for softwood and steel.
Application scenarios of self-tapping screws of different specifications
1. Self-tapping screws with a diameter of 3.5mm are suitable for light wood products, gypsum boards, etc.
2. Self-tapping screws with diameters of 4.2mm and 4.8mm are suitable for wood products, gypsum boards, etc. of medium hardness.
3. Self-tapping screws with a diameter of 5.5mm are suitable for harder wood products, frames, etc.
4. Self-tapping screws with shorter lengths are suitable for thinner wood products, gypsum boards, etc.
5. Self-tapping screws with longer lengths are suitable for reinforcing wood structures.
Matters needing attention when using self-tapping screws
1. Self-tapping screws need to be drilled before use, which helps to avoid cracking of the wood, and the drilling depth should be slightly deeper than the length of the self-tapping screw.
2. The diameter and length of the self-tapping screw need to be selected according to the usage scenario, and do not use them at will.
3. The insertion direction of the self-tapping screw should be perpendicular to the wood grain and keep it in a straight line.
4. When using the self-tapping screw, you must insert it with force until the head of the self-tapping screw touches the surface of the wood product.
5. When using the self-tapping screw, pay attention to the distance between the hole and the self-tapping screw. The hole distance should not exceed 1/3 of the length of the self-tapping screw.
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