Tag: chain sling stretch

Chain Sling Wear and Stretch: Are They the Same?

Chain Sling Wear and Stretch: Are They the Same?

chain sling wearFrédéric, a mechanical engineer for the auxiliary equipment unit of a Canadian public utility company and recent safety webinar attendee, asked the following question about chain sling wear:

“You said a sling should be removed from service if it stretches. But, you also said that 10% of wear is permissible. Does this mean that a stretch of 5 to 10% should be ok, because wear will make the sling stretch (the reach will increase)?”

Henry Brozyna, CMCO trainer and safety webinar presenter, answers:

Chain sling wear and stretch are two different things and both will make the sling length increase. So, it is sometimes difficult to differentiate between the two.

chain sling wear
An example of unacceptable chain wear
chain sling wear
An example of stretched/elongated chain

Wear will show itself at the bearing points of the links and can exhibit itself in the bearing points of the chain as a groove. A certain amount of wear is permissible and that will happen over time. Check with the manufacturer to see how much wear they allow.

Stretch or elongation are clear signs of overloading.  As such, ASME B30.9 Slings lists stretched chain links or components as one of the reasons a chain sling shall be removed from service. The word “shall” in a standard resolves any doubt.  No stretch or elongation is allowable. 

Want to learn more? View our recent safety webinar!

Additional Reference:

Understanding the Difference Between Chain Grades and How They’re Used

Henry Brozyna

Henry Brozyna is a Corporate Trainer specializing in Rigging & Load Securement for Columbus McKinnon Corporation.