10mm tan ground access mats 100 tons load capacity-High Aug 04, 2015 · Sokay or okayL are calculated by dividing MBL by a safety factor (SF). An example of this would be a chain that has a MBL of 2000 lbf (8.89 kN) would have a Sokay or okayL of 400 lbf (1.78 kN) if a safety factor of 5 (5:1, 5 to 1, or 1/5) is used.