6t Pintle Ring Coupling D-Value 49kN

$178.80$227.40 inc GST

or 4 fortnightly payments from $44.70 with Afterpay More info

Engineered for Quality



The Couplemate CM255 fixed ring coupling is ADR Approved and rated to 49kN for road vehicles driven on the highway.

Towing equipment over 3.5t must undergo dynamic cyclic testing resulting in a kN rating. Static testing for equipment under 3.5t results in a kg rating.

Ring couplings over 3.5t are no longer rated in tonnes. The Motor Vehicle Act of 2018 demands couplings to be certified in kN.

As a result, Couplemate has made it easy for you to select the correct truck and trailer combination from our drop-down chart.

For example,

  • 6-tonne trailer can be towed by a 20t truck
  • 10-tonne trailer can be towed by a 10t truck

How to calculate the D-Value of your tow vehicle. (cross-check) 

Currently, two types of ring coupling are available

  • Al-ko® – Agricultural use
  • Couplemate  – Highway Approved


  • CRN: 45953
  • D-Value 49kN
  • 3-inch Fixed Ring Coupling, four-hole mount
  • Hole spacings – 182mm x 52m x 16.8mm
  • Australian Design Rules ADRs

Ring Coupling park brakes

damaged ring couplingInstalled by DIY can be disastrous.

Is your pintle ring suffering excessive wear and tear? Your trailer may have its tandem spring setup in the wrong location.

Does the image on the right look familiar?

Equipment installed in the wrong location can have a tragic effect.

All trailers have different weights and lengths. Heavy loads must ensure even distribution across your axle load group.

Buy a set of tow ball scales and measure your pintle hook head weight. It must be within the 5% to 7% range for a tandem trailer.

Why are tow ball scales important? Read here.

Without a tow ball scale, the head weight of your coupler is guesswork.

DIY is great, but only if you are sure of the installation techniques.


View ADR Approval from Departments of Infrastructure Letter Here.

When you purchase from Couplemate Trailer Parts, your CRN identification number for this product is on your Invoice.

  1. A CRN number when installing this type of towing attached on new vehicles and trailers.
  2. ADR62/2 does not require an ADR compliance plate to be attached to certified products.
  3. The CRN on the approval letter will be the same CRN on your Invoice.
  4. Show vehicle inspectors this invoice during inspections of your trailer or vehicle if required.

If you are buying a similar product, just as good, with no CRN, then take it back as it may give you trouble down the track. The CRN should be on your Invoice.

Beware of fake ADR approval claims. These claims are common and cause problems during Vehicle Inspections.

Towing and Accessory Regulations for trailers over 4.5t.

List of available ring couplings and tow eyes

6t Pintle Ring Coupling – ADR Approved

Couplemate Trailer Parts sells only the best quality 6t Pintle Ring Coupling D-Value 49kN and caravan spare parts throughout Australia.

Customers are welcome to either pickup or take advantage of our low freight rates. Express shipping to Melbourne, Sydney, Brisbane, Perth, Adelaide, Darwin, and Hobart.

We also ship products to New Zealand via Australia Post Air Express.

© Steve Wotherspoon May 10, 2014. Images and text may be copied, provided a link back to the copied page and the source is displayed where the content or image is located.

Additional information

Weight8 kg
Dimensions40 × 20 × 8 cm
Ring Type



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