metric structural bolts

The 5% self-drilling screws are designed for use on thin metal sheets, typically ranging from 0.035 to 0.157 inches in thickness. These screws have a low drilling capacity and are ideal for applications where a clean and precise hole is required. The 5% self-drilling screws are commonly used in the HVAC industry, metal fabrication, and roofing projects. Their sharp point and fine threads allow for quick and easy installation, making them a preferred choice for professionals and DIY enthusiasts.

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The white wafer head of these self-drilling screws is characterized by a broad, flat surface that provides a wide bearing area. This design helps distribute the load more evenly, reducing the risk of damage to the material being fastened. The head is typically finished in a white coating that not only enhances aesthetic appeal but also offers a degree of corrosion resistance, which is particularly beneficial in outdoor applications or areas exposed to moisture.


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The heavy hex head bolt consists of a threaded shank and a large hexagonal head, which provides a larger surface area for better grip and torque transmission. The head design also prevents the bolt from turning during installation, ensuring a secure fit. The thread pitch and diameter of the bolt are crucial factors that determine its mechanical properties, such as tensile strength and shear strength. Generally, heavier bolts have greater strength due to their increased material volume.

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