... wide application.The machines are used for punching shear the cold crimped engine bed with the thickness ... strength of 450N/mm2. The specifications of punching shear are surveyed by the bit of TB5-20 ... if the TB, TL is increased, the punching shear strength is increased. In order to not damage ... 63T. If TB, TL are reduced, the punching shear strength surpasses the nominal tonnage, you can reduce ...