Safety Pins in the fastener industry are commonly referred to in English as Shear Pin (most widely used), but can also be called Safety Pin or Shear Bolt depending on the specific type.
A safety pin is an overload protection device typically installed in mechanical transmission systems or structural connections. When the equipment experiences torque, tension, or impact forces exceeding a set threshold, the safety pin deliberately fractures first, thereby disconnecting power transmission or releasing the connection to protect core components from damage. Its working principle is based on shear strength design, and once broken, it requires manual replacement.