'HR' stands for High Resistance. The 17.4 PH stainless steel that these shackles are forged from offers very high level mechanical performance characteristics.
These models, which form an integral part of the fittings on large ocean-going mono hulls and multi hulls, are also widely used in the industrial sector.
A Shackle forged in HR 17.4 Ph Stainless Steel can be up to 60% more resistant than a shackle made from 316L Stainless Steel.
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