If an anchor chain breaks while at anchor, it can be a dangerous situation that requires prompt action to prevent the vessel from drifting or running aground. Here are the steps to take if an anchor chain breaks:
Sound the alarm: Alert the crew and passengers to the situation and make sure everyone is aware of the potential danger.
Deploy a backup anchor: If you have a backup anchor on board, deploy it immediately to help hold the vessel in place. This may involve deploying the anchor manually or using a windlass if one is available.
Notify other vessels: Notify nearby vessels of the situation and request assistance if needed.
Prepare to move: If you are unable to deploy a backup anchor, prepare to move the vessel to a safe location or back to port.
Inspect the chain: Once the situation is under control, inspect the chain to determine the cause of the breakage and assess the extent of the damage. It may be necessary to replace the entire chain or just a section of it.
Conduct maintenance: Conduct maintenance on the chain and associated equipment to ensure they are in good working condition and able to withstand the forces of wind and waves.
Update safety procedures: Review and update safety procedures to prevent a similar incident from happening in the future.
It is important to take preventative measures to reduce the risk of an anchor chain breaking, such as regular inspection and maintenance, following manufacturer's instructions, and using the appropriate anchor and chain for the vessel and conditions.

Diameter | Size | U1 stud link anchor chain | U2 stud link anchor chain | U3 stud link anchor chain | Weight | |||||
D(φ) | ||||||||||
Outside length | Outside width | Proof load | Breaking load | Proof load | Breaking load | Proof load | Breaking load | 27.5M | ||
L | B | |||||||||
Inch | mm | mm | mm | KN | KN | KN | KN | KN | KN | KG |
1/2 | 12.5 | 75 | 45 | 46 | 66 | 66 | 92 | 92 | 132 | 98 |
9/16 | 14 | 84 | 50.4 | 58 | 82 | 82 | 116 | 116 | 165 | 119 |
5/8 | 16 | 96 | 57.6 | 76 | 107 | 107 | 150 | 150 | 216 | 156 |
11/16 | 17.5 | 105 | 63 | 89 | 127 | 127 | 179 | 179 | 256 | 186 |
3/4 | 19 | 114 | 68.4 | 105 | 150 | 150 | 211 | 211 | 301 | 230 |
13/16 | 20.5 | 123 | 73.8 | 123 | 175 | 175 | 244 | 244 | 349 | 260 |
7/8 | 22 | 132 | 79.2 | 140 | 200 | 200 | 280 | 280 | 401 | 300 |
15/16 | 24 | 144 | 86.4 | 167 | 237 | 237 | 332 | 332 | 476 | 370 |
1-1/16 | 26 | 156 | 93.6 | 194 | 278 | 278 | 389 | 389 | 556 | 431 |
1-1/8 | 28 | 168 | 100.8 | 225 | 321 | 321 | 449 | 449 | 642 | 496 |
1-3/16 | 30 | 180 | 108 | 257 | 368 | 368 | 514 | 514 | 735 | 564 |
1-1/4 | 32 | 192 | 115.2 | 291 | 417 | 417 | 583 | 583 | 833 | 635 |
1-5/16 | 34 | 204 | 122.4 | 328 | 468 | 468 | 655 | 655 | 937 | 712 |
1-7/16 | 36 | 216 | 129.6 | 366 | 523 | 523 | 732 | 732 | 1050 | 800 |
1-1/2 | 38 | 228 | 136.8 | 406 | 581 | 581 | 812 | 812 | 1160 | 887 |
1-9/16 | 40 | 240 | 144 | 448 | 640 | 640 | 896 | 896 | 1280 | 1032 |
1-5/8 | 42 | 252 | 151.2 | 492 | 703 | 703 | 981 | 981 | 1400 | 1084 |
1-3/4 | 44 | 264 | 158.4 | 538 | 769 | 769 | 1080 | 1080 | 1540 | 1197 |
1-13/16 | 46 | 276 | 165.6 | 585 | 837 | 837 | 1170 | 1170 | 1680 | 1310 |
1-7/8 | 48 | 288 | 172.8 | 635 | 908 | 908 | 1270 | 1270 | 1810 | 1438 |
2 | 50 | 300 | 180 | 686 | 981 | 981 | 1370 | 1370 | 1960 | 1546 |
2-1/16 | 52 | 312 | 187.2 | 739 | 1060 | 1060 | 1480 | 1480 | 2110 | 1661 |
2-1/8 | 54 | 324 | 194.4 | 794 | 1140 | 1140 | 1590 | 1590 | 2270 | 1791 |
2-3/16 | 56 | 336 | 201.6 | 851 | 1220 | 1220 | 1710 | 1710 | 2430 | 1926 |
2-5/16 | 58 | 348 | 208.8 | 909 | 1290 | 1290 | 1810 | 1810 | 2600 | 2086 |
2-3/8 | 60 | 360 | 216 | 969 | 1380 | 1380 | 1940 | 1940 | 2770 | 2249 |
2-7/16 | 62 | 372 | 223.2 | 1030 | 1470 | 1470 | 2060 | 2060 | 2940 | 2361 |
2-1/2 | 64 | 384 | 230.4 | 1100 | 1560 | 1560 | 2190 | 2190 | 3130 | 2516 |
2-9/16 | 66 | 396 | 237.6 | 1160 | 1660 | 1660 | 2310 | 2310 | 3300 | 2676 |
2-11/16 | 68 | 408 | 244.8 | 1230 | 1750 | 1750 | 2450 | 2450 | 3500 | 2885 |
2-3/4 | 70 | 420 | 252 | 1290 | 1840 | 1840 | 2580 | 2580 | 3690 |






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