The manufacturer's recommended maximum weight load
for a line, rope, crane or any other lifting device
of a lifting device. The SWL is determined by dividing the minimum breaking strength
(MBS) of a component by a safety factor
assigned to that type and use of equipment
. The safety factor generally ranges from 4 to 6 unless a failure
of the equipment could pose a risk
to life; in that instance the safety factor would be a 10. For example, if a line has an MBS of 1,000 pounds and a safety factor of 5, then the SWL would be 200 pounds. 1000 / 5 = 200. Also called working load limit (WLL).