Forging hooks have two kinds, forging single hook and forging double hook. It is generally forged with 20, 20MnSi steel. Eccentric force bearing of single hook is not as good as symmetrical force bearing of double hook, so small and medium tonnage cranes with a capacity of less than 75 tons usually use single hooks, and large tonnage cranes with more than 75 tons use double hooks. This type of hook is widely used and has its own system. In general, you can directly select according to the table without calculating. Safety hooks should be provided when there is a risk of unhooking from the wire rope.
The forging single hook is simple to manufacture and easy to use, but the force bearing is not good, and it is mostly used in working places with a lifting capacity of 80 tons or less;