Screws: Although the number of screws used in the production of tractors varies greatly, a series of screws used in tractor engines are considered standard and general screws. Meanwhile, special screws are also used in the tractor engine, whose production is highly sensitive.

The screws produced by Gashtavar Sanat Tadbirgaran Farda company are among the very special and important screws used in the tractor engine. These items include cylinder head bolts, connecting rod bolts, manifold bolts, cam adjustment bolts as well as other special bolts used in tractor engines.