m16 resin anchors

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.

...

When selecting a self-drilling screw for roofing, factors such as the thickness and type of roofing material must be considered to choose the appropriate screw length and diameter. Proper alignment during installation is also key to achieving optimal performance. Contractors and DIY enthusiasts alike appreciate the ease of use, which comes with a caveat the correct tool, typically an electric drill or impact driver, is necessary to drive these screws effectively.

...