The ORC recommendation for breaking strength is 4,500 lbs. I just bought jacklines for my boat from JSI. The highest breaking strength I could find was about the 5,700 lbs quoted above.
here's the ORC reference.
|4.04.1||The following shall be provided: |
|i||attached to through-bolted or welded deck plates or other suitable and strong anchorage fitted on deck, port and starboard of the yacht's centre line to provide secure attachments for safety harness:-||MoMu0,1,2,3 |
|ii||comprising stainless steel 1 x 19 wire of minimum diameter 5 mm (3/16 in), or webbing of equivalent strength; ||MoMu0,1,2,3 |
|iii||which, when made from stainless steel wire shall be uncoated and used without any sleeving;||MoMu0,1,2,3 |
|iv||20kN (2,040 kgf or 4,500 lbf) min breaking strain webbing is recommended;||MoMu0,1,2,3|
|v||at least two of which should be fitted on the underside of a multihull in case of inversion.|