Safety Chain Replacements & Repairs

A chain is only as strong as its weakest link. That’s where we come in – to make sure that every single link in your safety chain is safe, strong and adheres to Australian standards.

The Australian Standards require all safety chains to be stamped with the digits of the Importer/Manufacturer, the Australian Standards identification number 4177 and another 2 digits identifying the rating of the chain eg. 25 stands for 2500kg rated, 35 is 3500kg rated etc.

Therefore the stamp must appear as  eg. XXXX 4177-25 and these marks must be repeated at intervals not exceeding 4 links along the length of chain.

After all, if a worst-case scenario plays out and the coupling comes undone, the safety chain is the only thing stopping a trailer from careening off into traffic.

Repairing damaged safety chains

Damage to safety chains isn’t always immediately apparent so it’s important to have regular assessments by an expert who knows what to look for.

Sometimes chains become weakened if they drag too low. If they make contact with the ground it can wear away sections within the links. In addition, the welded section (where the chain joins the trailer) can be damaged through incidental bumps that occur when the trailer is in use or during the process of coupling and uncoupling. This weakens the welding at the join, creating a potential safety problem that can be hard to detect.

At Felk, we can do a thorough assessment for any weaknesses and then proceed with a repair. In many cases, this will be a simple cut and re-weld procedure. While safety is the key outcome, we’ll always work hard to get you back on the road as soon as possible.

Learn more about Safety Chains

  • If you’re towing over two tonnes, you require two safety chains. In these cases, we suggest the two chains are crisscrossed on attachment to car ie right chain to left anchor point and left chain to right anchor point. This method will also allow you to shorten the chain (still allowing for tight turns). Therefore, if the coupling does become detached, it may be supported by the cross over in the chains instead of just hitting the ground. Another handy hint from Felk Engineering.
  • There are many factors at play when determining the perfect length for safety chains, including the height of the tow ball. Ideally there should be 150mm distance between the lowest point of the safety chain and the road. Our experts at Felk can make an assessment to ensure your chain can stretch enough for you to safely complete a turn, but without pulling tight through the process (If we determine that a chain needs to be adjusted or shortened, any extra links can remain attached for you so that you can re-use them for other towing).
  • The thickness of the chain is a key factor and the appropriate chain can vary depending on the weight you’re towing. Our experts at Felk can guide you when it comes to choosing the right kind of stamped chain.


At Felk we are happy to work on any brand so whether you have a Felk or something different you can always drop in for an assessment, repair or replacement.

When it comes to safety chains you really want peace of mind that your chain is safe, strong and properly-fitted. To book a safety chain inspection or replacement, contact our team at Felk today.