NortonDommi (Jan 9, 2019)
lifting chain is often used incorrectly for other purposes & can suffer from forces other than those for lifting. Used for towing for example can stretch the links. dragging through a fire can change the properties without noticable external damage. Nicks, like a knot, also affect it safe working load. when it comes down to the point the very old addage "a chain is only as strong as it's weakest link" is correct. I believe that w.l.l & s.w.l takr into consideration various angles from vertical to almost level & the pressures therein & on. A good rule of thumb if damage like nicks, & stretches are evident then they must not be more than 10% of the link involved or the chain is not safe to use. This is also true of chain used for other purposes (beside lifting) eg: securing a piece of plant using "dog(s)".
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