SWL

Safe Working Load, aka Working Load Limit. A rating for a component of a rigging system. The SWL is derived by taking the tensile strength or breaking strength and applying a safety factor (5:1, 8:1, 10:1).
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From Sapsis Rigging site:
[FONT=Optima, Trebuchet MS, Verdana]Normal Working Load and Breaking Strength:
The Working Load Limit is the maximum load which should ever be applied to the product under any condition. The working load limit is based on static or moderately dynamic lifting/pulling operations where a load is being applied uniformly in a straight-line pull. SRI uses a 7 to 1 ratio to develop working loads in all critical applications.
The Breaking Strength is an average figure arrived at by testing samples under laboratory conditions in straight-line pulls with consistently increasing loads to see at what point they would break. DO NOT use breaking strength for design or rating purposes; use work load limit instead.
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