With this system the hardness and abrasion-resistant properties are put on top. Therefore, the material is selected must be capable of reaching the high-hardness heat outside to protect against abrasion, but at the same time have to have a computer inside to avoid the plastic snapped in the process of work.The handles by Islam must work continuously and axial bearing in the process should work for the priority of material properties as hardness, abrasion resistant plasticity in the core to avoid breaking in the process work (length/diameter ratio of pegs are often very large). The material of the PIN is usually the SKD 61 steel.
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