1. Bearings with a stretching rod, stretching rod with right or left hand, female or male thread. 2. It is made up of a fast movement spherical-plain radial bearing and rod ends. 3. The housing was forged by bearing steel GCr20, inner ring was milled by GCr15. The surface of rolling friction has been treated by quenching add to cementite. 4. Plate zinc on the surface body, the housing with a lubrication hole.