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My information has the 2-1/2 ton (10,000# winch 1/2" rope) and the 5 ton (20,000# winch 5/8" rope) as having the same lead chain, just as doghead mentioned. The minimum breaking strength of 1/2" series 70 chain is over 45,000#. Winching operations typically use a 2:1 safety factor. Commercial ratings for chain are typically 4:1, lifting is 5:1 (overhead). In ALL cases, the hooks should be the weak link, they should spread before the rope or chain fails. We have proven this over and over when we proof assemblies. Do not put a series 100 hook on series 70 chain, components should be load matched. Grab hooks reduce chain strength by 30%. The typical lead chain is 5', but then we have all seen wide variations of that. The critical part is the installation of the spelter and ASSURING that the rope does not corrode at the spelter termination.