Axle shafts or splined shafts used in construction machines and reducer boxes are an important power transmission tool in terms of position. The materials of the shafts are also important due to the power transmission and being under constant load. Generally, materials such as C4140 – C4340 – C8640 – C5140 are used for the shafts we produce. To increase the strength values; By improving, the micro structure of the material is thinned and the hardness is reduced or increased according to the usage situation, generally 32-37 Hrc is made.