The torque standard of M5 bolt is 5 Nm.one. The maximum torque that the M5 bolt of grade 4.8 can bear is 3 Nm, beyond which it will be twisted off.one2. The tightening torque is 2.94-5.88Nm.three. In the national standard of screw tightening torque, the standard torque of M5 screw is 14.5～18 kgf･cm.four. In the screw assembly torque specification, the assembly torque of M5 thread is 5.30 10% cm-kg.five