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SWL = Ultimate (Breaking) Strength/Design (Safety) Factor
Usually the safety factor used in lifting equipment is 5:1.
Example:
If you are using a 0.5" Improved Plow Wire Rope the ultimate strength is 11.5 tons.
SWL = 11.5/5 = 2.3 tons
The safety factor should go higher if there is possibility of injury or death.
Example: Elevators use a 20:1 safety factor.
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∙ 12y ago
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