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Hello,
First, "safe working load" is not a terribly meaningful term, without specific qualification. In yacht gear, a safety factor of 2:1 is fairly standard, which is to say that the pressure to save weight, combined with the relatively mild working conditions, means we can usually get away with that. But I use 2.5:1 or more for standing rigging, and higher on crucial pieces like V1's on disco rigs, and higher still for industrial or theater applications.
Next we need to know what Colligo means by safe working load. It might be relative to yield, not disintegration, for instance.
So we need to know if that -10 was the right size. Then we can relate its strength meaningfully to the Colligo fitting.
As for adapting the Colligo fitting to your masthead, have you talked to John at Colligo? He's very helpful.
Fair leads,
Brion Toss
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