Prolyte Campus blog: Shackles inspection

As stated in a previous blog: don’t waste your money on some inspection company to check your shackles if you can easy learn to do it yourself.

The issue: Notified Body inspectors barely do a serious job in checking your shackles, because they don’t need to. But they still send you an invoice, so you might be better off to do the job yourself.

The reply: Any user should know the company that manufactured his shackles. Most manufacturers have a distinguished colour of their shackle pins; so strange colours or no colours at all could be a warning that the item might be strange inventory. The manufacturer will showcase drawings with specific dimensions for the specific load rating sizes. 

You don’t need a set of callipers all the time, but a strange shaped shackle of a well-known brand is a warning sign. Any change in dimensions of over 5% should be a reason to investigate what happened, and any change of 10% or more is reason for discard and still do the investigation.

One of the most common mistakes – and a potential hazard – is using the wrong bolt in the shackle. BMW is BMW and never use a Mack-part in a Mercedes, or a GM-part in a Volkswagen. It just is not safe!

The picture on the right is no fiction, this could happen! 

Wear can happen more easily in our business, since people drag bridles across a concrete arena floor, that will act as sandpaper or even a grinder. The most obvious positions that could show wear are indicated on the right. In our business the internal wear might be less likely, but nevertheless a risk.

The verdict: Always check the dimensions, easy rotating of the pin, wear of the shackle and the WLL mark.

When a grinder is used to remove the brand name (or any other identification), there should be serious checking on other aspects as well, to start with the mind-set of the guy who did that. 



Post your questions at the Prolyte Forum


Due to the quality of the Prolyte truss, we would be able to span the complete stage width of 40m with one single span, without any columns or support points.

Eduardo Brewer PROMontaje