Armor Bolts

Armor bolt – lining bolts – armor bolts – are used in the mining industry and are intended for fixing armor facing plates inside the lining of ball mills used for grinding ore-containing rock. Shaped countersunk head, allows the installed bolt not to protrude above the surface of the armor plate.

Depending on the operating conditions, the lining bolts are made of carbon, stainless or heat-resistant steels.

Lining bolts are fasteners for connecting the armor (lining) to the body part of the mechanism on which it is installed. Lining bolts are based on threaded fasteners, which means that they function complete with nuts and washers.

The main products where linings and lining bolts are used are bunkers, mills, chemical apparatuses and pickling baths. Since the bolts work in extremely difficult conditions with regular dynamic and static overloads, they are made from special carbon steels.

In cases where they have to work in high temperature conditions, heat-resistant materials are used. A mandatory requirement for this type of bolt is the presence of an anti-corrosion surface. Therefore, most of the lining fasteners are made of stainless steel.

The main field of application of armor bolts is the mining industry. Facing plates are installed inside ball mills or other equipment where ore and other raw materials are crushed. Armor bolts are designed to tightly hold the planes on which the grinding is carried out. Grinding is done using heavy falling balls and other percussion instruments. Without the use of lining plates, the mill body would quickly deform.

A special feature of lining bolts is their special head. Due to its shape and size, it is attached to the armor in such a way that it completely hides or merges with the surface. To do this, special holes are made on the armor, into which the bolts are lowered and become “flush” with the surface. Accordingly, when installing lining bolts, you should choose products with a certain size of the head, so that they can perform their connecting functions and not get out of the edges of the armor. There are two forms of heads: square and oval. The length of the bolt can vary widely depending on the thickness of the armor.