2.5t Aluminium Trailer Safety Chain Holder Kit

Part No: CM546-5 Category:


23 in stock

Safety chain is required on all boat trailers with a rigid drawbar. This boat trailer chain holder kit suits marine application and is designed for all boat trailers up to 2.5t ATM.

✓ Designed for maximum 2.5t ATM boat trailers with an aluminium body.
Kit includes galvanised safety chain, G80 hammerlock, and drawbar holder.
Easily bolts to the aluminium drawbar through Grade 8 bolts (not included).

23 in stock

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2.5t Aluminium Trailer Safety Chain Holder Kit

Safety chain holder for aluminium chassis rail. High Tensile, grade 8.8 bolts are required but not included.

This chain holder passed all regulatory requirements for safety chain attachment to aluminium boat trailers.

The chain holder is welded to an 8mm plate. It is not legal to bolt safety chains to the trailer, although we have often witnessed bolted safety chains on trailers at the boat ramp.

Safety chain holders are available in two models:

  • 10mm suit trailers up to 2.5t
  • 13mm suit trailers from 2.5t to 3.5t (note, two pcs required)

Comparative products

Dee or bow shackles are not approved for attaching safety chains to safety chain holders (on the trailer).

Conversely, dee / Bow shackles are approved for attachment of the safety chain to the tow bar only.

Regarding lengthening safety chains. Hammerlocks but not multiple dee shackles may lengthen chains.

Furthermore, dee shackles do not connect to the safety chain holder, so the chain must not be detached from the chassis rail under any circumstance. It is possible to separate the chain using dee shackles.

Also, once the safety chain holder has been installed and tensioned by your installer, it is installed for life or until the manufacturer decides the holder should be upgraded.

Safety Chain Plate Specifications

Safety Chain Plate Specifications


In the past, we have seen some pretty lousy chain setups. As a result, we took time to invent a simple solution to a critical problem.

You are required to weld the safety chain or safety chain holder to your chassis rail. Welding the chain holder to a bracket and then bolting to the chassis rail using Grade 8 bolts is an accepted practice.

For example, welding steel brackets to aluminium trailers is impossible unless some innovative engineering is provided.

In the case of a welding chain directly to the trailer, the weld must cover 1/2 the link only. However, the Aluminum chain is not permissible to use as a safety chain.

In conclusion, the bracket holes accommodate 6 x M8.8 high tensile bolts and 100mm of weld top and bottom.

Additional information

Weight4 kg
Dimensions20 × 10 × 10 cm

250G Steel, High Tensile Steel (4140), High-Tensile Alloy Steel (G80)

Maximum ATM

2500kg (2.5t)



Our Service Lifetime Warranty

Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

Couplemate™ is a manufacturer and vendor of high-quality towing, trailer, and caravan components. Couplemate™ Core Goods and Custom Work are guaranteed to be free of defects for the service lifetime of the product when used as intended.

Warranties are non-transferrable and Couplemate™ requires satisfactory proof of purchase prior to issuing a remedy. The full Couplemate™ Warranty Policy can be found in the Terms & Conditions: Section 8 – Consumer Guarantees & Warranty.

Warranties are in addition to your rights under the Australian Consumer Law. If something is wrong with your order, please contact our team.

60-Day Returns

After 60 years of experience, we know that life has its unpredictable moments.

All Couplemate™ orders (online, over the phone, or in-store) have a 60 day period for change-of-mind returns and exchanges. There are some items that can’t be returned and some returns may incur a 15% restocking fee.

You can view our full policy for change-of-mind returns here.


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