Fasting keys are needed to attach bolts.

There must be a thread on this rod. Moreover, it can go like along the entire length of the rod, and only in terms of the rod. It all depends on the type of bolt and its purpose. On the one hand, the bolt is usually thread, and on the other — the head that resembles a hexagon. Typically, bolts make standard sizes. But, at the same time, it is important to consider that they completely coincide with other fasteners. All elements should complement each other, combine. Only in this case the fasteners will be reliable and said. Fasting keys are needed to attach bolts.