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Driver's Handbook on Cargo Securement - Appendix A: Default WLLs for Inmarked Tiedowns

SizeGrade 30 proof coilGrade 43 High testGrade 70 TransportGrade 80 AlloyGrade 100 Alloy
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)
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)
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)
11 mm (7/16 in)1680 kg (3700 lb)3270 kg (7200 lb)3970 kg (8750 lb)--
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)
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)
Chain Marks     
Example 1347810
Example 230407080100
Example 33004007008001000
MANILA ROPE
Diameter
WLL
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)
Diameter
WLL
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
Width-Thickness Inch
WLL
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
Width
WLL
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)
Diameter
WLL
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)
Diameter
WLL
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
Diameter
WLL
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
Diameter
WLL
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.)
 
Updated: Friday, March 14, 2014