Lifting hooks provide a safe and convenient way of lifting and manoeuvring loads. Lifting hooks are used in conjunction with slings, ropes and chains that are attached to a hoist or crane.
The following are some factors that need to be considered when choosing the appropriate hook for your application:
Load Weight & Working Load Limit (WLL)
The hook’s Working Load Limit (WLL) must always exceed the total load weight, including all rigging hardware. The WLL is the maximum safe load capacity and is clearly marked on the hook. Never confuse this safety margin for permission to exceed the WLL. Choosing a hook with an appropriate WLL for the load is the most fundamental rule for ensuring a safe lift.
Lifting Application
It is critical that the hook is specifically designed and rated for overhead lifting. Only use hooks specifically designed and rated for overhead lifting. They are built to strict standards (like ASME) with a high safety factor.
Connection Type
The hook attaches via its shank, which must match the connecting hardware. The most common type is a clevis shank, secured with a pin and cotter pin, allowing for pivot. An eye hook connects via its integrated eye to a shackle.
Industry & Environmental Conditions
Standard hooks fail in high heat or corrosive environments. Use heat-treated alloy hooks for high temperatures and stainless steel or galvanized hooks for moisture or chemicals. The environment dictates the required hook material.