Nominal Rope * Diameter Approx. weight/mass. Minimum breaking load/force for 1570 OR 1370 / 1770 N/mm2 inch mm Ibs/100ft kg/100m 1000 Ibs. KN 1/4 6.5 10.8 16.1 5.6 24.7 5/16 8 16.1 24.0 8.1 36.2 9 20.6 30.7 10.3 46.0 10 25.9 38.5 12.9 57.6 7/16 11 31.3 46.6 15.7 69.9 15/32 12 37.0 55.1 18.6 82.7 13 44.1 65.6 22.1 98.2 9/16 14 50.6 75.3 25.5 113.6 5/8 16 66.1 98.4 33.1 147.4 23/32 18 82.7 123.0 41.5 184.4 25/32 20 102.8 153.0 51.7 230.0