metal roofing self drilling screw

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.

...

A double end stud, as its name implies, is a type of fastener that features two threaded ends with a unthreaded shank in between. This unique configuration allows it to serve as a versatile connector in a range of applications. Historically, the design of the double end stud emerged from the need for robust fastening solutions that could withstand significant stress and load. Its origins can be traced back to the industrial revolution when the demand for durable and reliable construction materials surged as industries expanded.


...

The design of a bolt structure also involves careful consideration of its mechanical properties, such as tensile strength, shear strength, and fatigue resistance. Tensile strength refers to the maximum load a bolt can withstand while being pulled in tension, whereas shear strength is associated with the load bearing capacity when the bolt experiences forces perpendicular to its axis. Fatigue resistance is particularly important in structures subjected to repeated loading cycles, as it ensures that the bolt can withstand the wear and tear of regular operation without failure.


...