What does WLL (Working Load Limit) mean?
WLL appears on every shackle, sling and hook, but many people confuse it with breaking strength. That confusion is dangerous. This guide explains what WLL means and how to use it.
What Does WLL Mean?
WLL stands for working load limit. It is the maximum load a piece of rigging gear is rated to lift or pull in normal service. It is the number you must not exceed.
WLL vs Breaking Strength
Breaking strength is the load at which the gear actually fails. WLL is much lower because it includes a safety factor. A component with a 5 tonne breaking strength may have a WLL of only 1 tonne.
Where to Find the WLL
The WLL is stamped on the body of the shackle, hook or chain, or on the tag of a sling. If the marking is missing or unreadable, the gear must be taken out of service.
How to Use WLL
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Calculate the maximum load, including shock loads.
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Choose gear with a WLL at or above that load.
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Check the marking and certificate before each lift.
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Never use breaking strength as your working figure.
FAQ
What does WLL mean in rigging?
It is the working load limit, the maximum safe load for the component in normal service.
Is WLL the same as SWL?
Yes. Safe working load (SWL) is the older term for the same concept.
Rig With Rated Gear
SolidLink marks every shackle and hook with its WLL and provides certificates. Browse our shackles or contact us for a quote.
