[RIGGER’S CORNER]


WHY IS THIS CONNECTING LINK UNSUITABLE FOR USE?


BY: THE CROSBY GROUP


Have a look at the photo to the right. Do you see a problem? It might be hard to tell, but this is an alloy connecting link for a chain, the A-1337 “LOK-A-LOY.”


It is suitable for joining two lengths of chain end- to-end, or for connecting a length of chain to a fitting. Tis connecting link, however, has been assembled onto a pad eye AND has a length of chain on each end. All Crosby products have been designed and tested for a specific set of loading conditions. Which includes a load limit, temperature range, direction of loading, torque requirements, etc. Deviating from these parameters can result in catastrophic loss of load.


Te figure to the left shows where the load can be applied, and the direction that is acceptable. Tis part is strictly for inline loading only. Te LOK-A-LOY in the photo has a slightly different loading condition. Both lengths of the chain are pulling in the same direction while the pivot pin is being held by the pad eye. Te angle of pull is also down which introduces a bending moment to the pin.


Crosby did not anticipate this loading scenario, and it has not been tested. Bottom line – the product’s performance is unpredictable and therefore unsuitable for use in this application. y


Visit the Crosby Group’s website for an extensive range of training information, product support and news and events at www.thecrosbygroup.com


80 JULY–AUGUST 2018 WIRE ROPE EXCHANGE


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