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Driver's Handbook on Cargo Securement - Appendix A: Default WLLs for Inmarked Tiedowns
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Appendix A: Default WLLs for Inmarked TiedownsWorking Load Limit | Size | Grade 30 proof coil | Grade 43 High test | Grade 70 Transport | Grade 80 Alloy | Grade 100 Alloy |
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| 7 mm (1/4 in) | 580 kg (1300 lb) | 1180 kg (2600 lb) | 1430 kg (3150 lb) | 1570 kg (3500 lb) | 1950 kg (4300 lb) |
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| 8 mm (5/16 in) | 860 kg (1900 lb) | 1770 kg (3900 lb) | 2130 kg (4700 lb) | 2000 kg (4500 lb) | 2600 kg (5700 lb) |
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| 10 mm (3/8 in) | 1200 kg (2650 lb) | 2450 kg (5400 lb) | 2990 kg (6600 lb) | 3200 kg (7100 lb) | 4000 kg (8600 lb) |
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| 11 mm (7/16 in) | 1680 kg (3700 lb) | 3270 kg (7200 lb) | 3970 kg (8750 lb) | - | - |
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| 13 mm (1/2 in) | 2030 kg (4500 lb) | 4170 kg (9200 lb) | 5130 kg (11300 lb) | 5440 kg (12000 lb) | 6800 kg (15000 lb) |
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| 16 mm (5/8 in) | 3130 kg (6900 lb) | 5910 kg (13000 lb) | 7170 kg (15800 lb) | 8200 kg (18100 lb) | 10300 kg (22600 lb) |
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| Chain Marks | | | | | |
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| Example 1 | 3 | 4 | 7 | 8 | 10 |
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| Example 2 | 30 | 40 | 70 | 80 | 100 |
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| Example 3 | 300 | 400 | 700 | 800 | 1000 |
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| MANILA ROPE |
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Diameter | WLL |
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10 mm (3/8 in) | 90 kg (205 lb.) | 11 mm (7/16 in) | 120 kg (265 lb.) | 13 mm (1/2 in) | 150 kg (315 lb.) | 16 mm (5/8 in) | 210 kg (465 lb.) | 20 mm (3/4 in) | 290 kg (640 lb.) | 25 mm (1 in) | 480 kg (1050 lb.) |
WIRE ROPE (6 x 37, Fiber Core) |
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Diameter | WLL |
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7 mm (1/4 in) | 640 kg (1400 lb.) | 8 mm (5/16 in) | 950 kg (2100 lb.) | 10 mm (3/8 in) | 1360 kg (3000 lb.) | 11 mm (7/16 in) | 1860 kg (4100 lb.) | 13 mm (1/2 in) | 2400 kg (5300 lb.) | 16 mm (5/8 in) | 3770 kg (8300 lb.) | 20 mm (3/4 in) | 4940 kg (10900 lb.) | 22 mm (7/8 in) | 7300 kg (16100 lb.) | 25 mm (1 in) | 9480 kg (20900 lb.) |
STEEL STRAPPING |
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Width-Thickness Inch | WLL |
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31.7 x 0.74 (1-1/4 x 0.029) | 540 kg (1190 lb.) | 31.7 x 0.79 (1-1/4 x 0.031) | 540 kg (1190 lb.) | 31.7 x 0.89 (1-1/4 x 0.035) | 540 kg (1190 lb.) | 31.7 x 1.12 (1-1/4 x 0.044) | 770 kg (1690 lb.) | 31.7 x 1.27 (1-1/4 x 0.050) | 770 kg (1690 lb.) | 31.7 x 1.5 (1-1/4 x 0.057) | 870 kg (1925 lb.) | 50.8 x 1.12 (2 x 0.044) | 1200 kg (2650 lb.) | 50.8 x 1.27 (2 x 0.050) | 1200 kg (2650 lb.) |
SYNTHETIC WEBBING |
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Width | WLL |
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45 mm (1-3/4 in) | 790 kg (1750 lb.) | 50 mm (2 in) | 910 kg (2000 lb.) | 75 mm (3 in) | 1360 kg (3000 lb.) | 100 mm (4 in) | 1810 kg (4000 lb.) |
POLYPROPYLENE FIBER ROPE (3-STRAND AND 8-STRAND CONSTRUCTIONS) |
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Diameter | WLL |
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10 mm (3/8 in) | 180 kg (400 lb.) | 11 mm (7/16 in) | 240 kg (525 lb.) | 13 mm (1/2 in) | 280 kg (625 lb.) | 16 mm (5/8 in) | 420 kg (925 lb.) | 20 mm (3/4 in) | 580 kg (1275 lb.) | 25 mm (1 in) | 950 kg (2100 lb.) |
POLYESTER FIBER ROPE (3-STRAND AND 8-STRAND CONSTRUCTIONS) |
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Diameter | WLL |
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10 mm (3/8 in) | 250 kg (555 lb.) | 11 mm (7/16 in) | 340 kg (750 lb.) | 13 mm (1/2 in) | 440 kg (960 lb.) | 16 mm (5/8 in) | 680 kg (1500 lb.) | 20 mm (3/4 in) | 850 kg (1880 lb.) | 25 mm (1 in) | 1500 kg (3300 lb.) |
NYLON ROPE |
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Diameter | WLL |
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10 mm (3/8 in) | 130 kg (278 lb.) | 11 mm (7/16 in) | 190 kg (410 lb.) | 13 mm (1/2 in) | 240 kg (525 lb.) | 16 mm (5/8 in) | 420 kg (935 lb.) | 20 mm (3/4 in) | 640 kg (1420 lb.) | 25 mm (1 in) | 1140 kg (2520 lb.) |
DOUBLE BRAIDED NYLON ROPE |
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Diameter | WLL |
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10 mm (3/8 in) | 150 kg (336 lb.) | 11 mm (7/16 in) | 230 kg (502 lb.) | 13 mm (1/2 in) | 300 kg (655 lb.) | 16 mm (5/8 in) | 510 kg (1130 lb.) | 20 mm (3/4 in) | 830 kg (1840 lb.) | 25 mm (1 in) | 1470 kg (3250 lb.) |
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