Working Load Limit (WLL) is a term used by manufacturers to indicate the maximum force that should be applied to a carabiner or any other piece of equipment in normal use, regardless of industry. The ratio of MBS to WLL is referred to as the Design Factor (DF). Many carabiner manufacturers specify a DF of 4 which implies a WLL of 25% of the MBS. Manufacturers state the WLL to ensure that the carabiner is not subjected to significant fatigue and remains in the range of normal elastic deformation.

calc: WLL calculation
MBS (Minimum Breaking Strength) =
DF (Design Factor) =
quiz: Who or what determine the WLL?
Safety supervisor
Rope master
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