WLL vs breaking strength: reading the tag properly

Every rated piece of lifting equipment, from slings and shackles through to hooks and chain, carries a Working Load Limit (WLL). It's the maximum load the item is designed to handle in normal service, straight-line pull.

WLL is not the breaking point

Lifting equipment is manufactured with a safety factor: the minimum breaking strength is a multiple of the WLL (commonly several times higher, depending on the product type). That margin exists to absorb the things you can't perfectly control, like shock loading, wear, edge loading and dynamic movement.

The margin is not spare capacity. A 2t round sling is a 2t sling, full stop. If the lift is 2.4t, you need bigger equipment, not optimism.

Things that quietly reduce capacity

• Sling angles: two legs at a wide angle carry far more force per leg than the same legs pulling straight up
• Choke hitches: choking a sling around a load reduces its rated capacity
• Edges: a sharp edge can cut a synthetic sling under load; use protective sleeves
• Damage and age: cuts, abrasion, UV bleaching, missing tags. Out of service.

The habit that saves lives

Read the tag before every lift. If the tag is gone, the equipment is done. Retire it.

General guidance only. Always follow the manufacturer's ratings and your site's lifting procedures.