The R4 Offshore Stud Link Mooring Chain is a high-strength, quenched and tempered steel chain engineered for the station-keeping of deepwater offshore structures in extreme marine environments. Designed for offshore oil and gas platforms, FPSOs, and floating production units, the R4 grade delivers exceptional reliability under continuous dynamic loading with a tensile strength of 860 MPa and yield strength of 580 MPa.
The stud link design features a central crossbar (stud) inside each link, which significantly improves the chain‘s resistance to deformation and prevents kinking and twisting under heavy loads. This makes stud link chains the preferred choice for high-load, long-term offshore mooring applications where strength and resistance to deformation are essential.
Available in diameters from 34mm to 162mm with black painted finish as standard.
Specification Of R4 Offshore Stud Link Mooring Chain:
| Nominal | R3S | R4 |
| Dia | Studlink | Studless | BL (KN) | Studlink | Studless | BL (KN) |
| (mm) | PL (KN) | PL (KN) | PL (KN) | PL (KN) |
| 34 | 859 | 831 | 1188 | 1031 | 916 | 1308 |
| 36 | 960 | 928 | 1327 | 1151 | 1022 | 1460 |
| 38 | 1065 | 1029 | 1473 | 1278 | 1135 | 1621 |
| 40 | 1176 | 1136 | 1626 | 1411 | 1253 | 1789 |
| 42 | 1285 | 1242 | 1777 | 1542 | 1370 | 1958 |
| 44 | 1411 | 1364 | 1951 | 1693 | 1503 | 2147 |
| 46 | 1535 | 1484 | 2124 | 1843 | 1636 | 2337 |
| 48 | 1665 | 1610 | 2304 | 2037 | 1775 | 2535 |
| 50 | 1800 | 1743 | 2490 | 2160 | 1918 | 2740 |
| 52 | 1939 | 1877 | 2682 | 2327 | 2066 | 2952 |
| 54 | 2083 | 2017 | 2881 | 2499 | 2219 | 3170 |
| 56 | 2231 | 2160 | 3086 | 2677 | 2378 | 3396 |
| 58 | 2383 | 2308 | 3297 | 2860 | 2540 | 3628 |
| 60 | 2540 | 2460 | 3514 | 3048 | 2708 | 3867 |
| 62 | 2701 | 2616 | 3737 | 3242 | 2879 | 4112 |
| 64 | 2867 | 2776 | 3965 | 3440 | 3055 | 4364 |
| 66 | 3036 | 2940 | 4200 | 3643 | 3235 | 4621 |
| 68 | 3209 | 3108 | 4440 | 3851 | 3420 | 4885 |
| 70 | 3387 | 3289 | 4685 | 4064 | 3610 | 5156 |
| 73 | 3660 | 3545 | 5064 | 4392 | 3900 | 5572 |
| 76 | 3942 | 3818 | 5454 | 4731 | 4206 | 6001 |
| 78 | 4135 | 4004 | 5720 | 4962 | 4411 | 6295 |
| 81 | 4431 | 4291 | 6130 | 5317 | 4727 | 6745 |
| 84 | 4735 | 4585 | 6550 | 5682 | 5051 | 7208 |
| 87 | 5046 | 4887 | 6981 | 6056 | 5383 | 7682 |
| 90 | 5365 | 5196 | 7422 | 6439 | 5724 | 8167 |
| 92 | 5582 | 5405 | 7722 | 6699 | 5955 | 8497 |
| 95 | 5913 | 5726 | 8180 | 7096 | 6308 | 9001 |
| 97 | 6138 | 5943 | 8490 | 7365 | 6547 | 9343 |
| 100 | 6480 | 6275 | 8964 | 7776 | 6912 | 9864 |
| 102 | 6712 | 6500 | 9285 | 8054 | 7160 | 10217 |
| 105 | 7065 | 6842 | 9773 | 8478 | 7536 | 10754 |
| 107 | 7304 | 7072 | 10103 | 8764 | 7791 | 11118 |
| 111 | 7789 | 7543 | 10775 | 9347 | 8309 | 11856 |
| 114 | 8159 | 7901 | 11287 | 9791 | 8704 | 12420 |
| 117 | 8535 | 8265 | 11807 | 10242 | 9105 | 12993 |
| 120 | 8916 | 8634 | 12334 | 10700 | 9511 | 13573 |
| 122 | 9173 | 8883 | 12690 | 11008 | 9785 | 13964 |
| 124 | 9433 | 9134 | 13048 | 11319 | 10062 | 14358 |
| 127 | 9825 | 9514 | 13951 | 11790 | 10480 | 14955 |
| 130 | 10222 | 9898 | 14140 | 12266 | 10903 | 15559 |
| 132 | 10488 | 10157 | 14509 | 12586 | 11187 | 15965 |
| 137 | 11163 | 10809 | 15442 | 13395 | 11907 | 16992 |
| 142 | 11847 | 11472 | 16389 | 14217 | 12637 | 18034 |
| 147 | 12540 | 12144 | 17348 | 15049 | 13377 | 19089 |
| 152 | 13242 | 12823 | 18318 | 15890 | 14125 | 20157 |
| 157 | 13950 | 13508 | 19297 | 16740 | 14880 | 21234 |