Proof and breaking loads
LOAD (in kN) = c x d2 x (44 - 0.08 x d) ( d in mm)
MASS (in kg/m) = 0.0219 x d2 (d in mm)
Due to the application of different rounding - off - principles at calculation of loads, individual classification societies show slightly different load values in their tables for vessels.
The table below for vessels is based on the table established by the international association of classification societies (IACS).
 
Diameter of Chain
d 		Anchor Chain for Vessel Offshore Mooring Chain Number of links per 27.5m Approx mass (weight)
Grade 2 Grade 3 ORQ, RQ3 NV K3 RIG NV K4 RIG, RQ4
IACS API, ABS DNV DNV, ABS
Proof
Test
Load 		Break
Test
Load 		Proof
Test
Load 		Break
Test
Load 		Proof
Test
Load 		Break
Test
Load 		Proof
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Load 		Break
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Load 		Proof
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Load
  c 0.0098 0.0137 0.0137 0.0196 0.014 0.0211 0.0148 0.0211 0.0216 0.0274 per m per 27.5m
in. mm KN KN KN KN KN KN KN KN KN KN Links kg kg
13/16 20.5 175 244 244 349 249 376 - - - - 331 9.2 253
7/8 22 200 280 280 401 286 431 - - - - 309 10.6 292
15/16 24 237 332 332 476 339 511 - - - - 283 12.6 347
1 26 278 389 389 556 397 598 - - - - 261 14.8 407
1.1/8 28 321 449 449 642 458 691 - - - - 243 17.2 473
1.3/16 30 368 514 514 735 524 790 - - - - 225 19.7 542
1.1/4 32 417 583 583 833 594 895 - - - - 211 22.4 616
1.5/16 34 468 655 655 937 668 1007 - - - - 199 25.3 696
1.7/16 36 523 732 732 1050 746 1124 - - - - 189 28.4 781
1.1/2 38 581 812 812 1160 828 1248 - - - - 179 31.6 869
1.9/16 40 640 896 896 1280 914 1377 - - - - 169 35.0 963
1.5/8 42 703 981 981 1400 999 1513 - - - - 161 38.6 1062
1.3/4 44 769 1080 1080 1540 1097 1654 - - - - 155 42.4 1166
1.13/16 46 837 1170 1170 1680 1194 1800 - - - - 147 46.3 1273
1.7/8 48 908 1270 1270 1810 1295 1952 - - - - 141 50.4 1386
2 50 981 1370 1370 1960 1400 2110 1480 2110 2160 2740 135 54.8 1507
2.1/16 52 1060 1480 1480 2110 1508 2273 1590 2270 2330 2960 131 59.2 1628
2.1/8 54 1140 1590 1590 2270 1620 2441 1710 2440 2500 3170 125 63.8 1755
2.3/16 56 1220 1710 1710 2430 1735 2615 1830 2610 2680 3400 121 68.7 1889
2.5/16 58 1290 1810 1810 2600 1854 2794 1960 2794 2860 3630 117 73.6 2024
2.3/8 60 1380 1940 1940 2770 1976 2978 2090 2978 3050 3870 113 78.8 2167
2.7/16 62 1470 2060 2060 2940 2101 3166 2220 3170 3240 4120 109 84.2 2316
2.1/2 64 1560 2190 2190 3130 2230 3360 2360 3360 3440 4370 105 89.7 2467
2.5/8 66 1660 2310 2310 3300 2361 3559 2500 3560 3640 4630 103 95.4 2624
2.11/16 68 1750 2450 2450 3500 2496 3762 2640 3760 3850 4890 99 101.3 2786
2.3/4 70 1840 2580 2580 3690 2634 3790 2780 3970 4060 5160 97 107.3 2951
2.7/8 73 1990 2790 2790 3990 2846 4291 3010 4290 4390 5580 93 116.7 3209
3 76 2150 3010 3010 4300 3066 4621 3240 4620 4730 6010 89 126.5 3479
3.1/16 78 2260 3160 3160 4500 3216 4847 3400 4850 4960 6300 87 133.2 3663
3.3/16 81 2410 3380 3380 4820 3446 5194 3640 5190 5320 6750 83 143.7 3952
3.5/16 84 2580 3610 3610 5160 3683 5550 3890 5550 5680 7220 81 154.5 4249
3.7/16 87 2750 3850 3850 5500 3924 5916 4150 5920 6060 7690 77 165.8 4560
3.9/16 90 2920 4090 4090 5840 4173 6289 4410 6290 6440 8180 75 177.4 4879
3.5/8 92 3040 4260 4260 6080 4342 6544 4590 6540 6700 8510 73 185.4 5099
3.3/4 95 3230 4510 4510 6440 4599 6932 4860 6930 7100 9010 71 197.6 5434
3.13/16 97 3340 4680 4680 6690 4774 7195 5040 7200 7370 9360 71 206.1 5668
3.15/16 100 3530 4940 4940 7060 5040 7596 5320 7600 7780 9880 67 219.0 6023
4 102 3660 5120 5120 7320 5220 7868 5510 7870 8050 10230 67 227.8 6265
4.1/8 105 3850 5390 5390 7700 5495 8282 5800 8280 8480 10770 65 241.4 6639
4.3/16 107 3980 5570 5570 7960 5681 8561 6000 8560 8760 11130 63 250.7 6894
4.3/8 111 4250 5940 5940 8480 6058 9130 6400 9130 9350 11870 61 269.8 7420
4.1/2 114 4440 6230 6230 8890 6346 9565 6700 9570 9790 12440 59 284.6 7827
4.5/8 117 4650 6510 6510 9300 6639 10005 7000 10000 10240 13010 57 299.8 8245
4.3/4 120 4850 6810 6810 9720 6935 10452 7320 10450 10700 13590 57 315.4 8674
4.7/8 124 5140 7200 7200 10280 7336 11057 7750 11060 11320 14380 55 336.7 9259
5 127 5350 7490 7490 10710 7641 11516 8070 11520 11790 14980 53 353.2 9713
5.3/16 132 5720 8000 8000 11420 8157 12294 8610 12290 12590 15990 51 381.6 10494
5.3/8 137 6080 8510 8510 12160 8682 13085 9170 13090 13400 17020 49 411.0 11303
5.9/16 142 6450 9030 9030 12910 9214 13887 9730 13890 14220 18060 47 441.6 12144
5.3/4 147 6840 9560 9560 13660 9753 14700 10290 14700 15050 19120 47 473.2 13013
6 152 7220 10100 10100 14430 10299 15522 10870 15520 15890 20190 45 506.0 13915
6.3/16 157 7600 10640 10640 15200 10850 16352 11450 16350 16740 21270 43 539.8 14845
6.3/4 162 7990 11170 11170 15970 11405 17189 12040 17190 17500 22350 43 574.7 15804
Quality ORQ + 20% has proof - and break - test - values 20% higher than the values for ORQ.