CTA-045126 – 4.5t x 70mm Ball Coupling
Price
$290.00 Inc.GST
- Electric trailer coupling with parking brake
- Suits a 70mm tow ball and is rated to 4.5t
- 36kN ball D-value and 16.2kN ball V-value
- 184mm x 56mm x 16mm mounting hole spacing
- CTA approval CTA-045126
Shipping
4.5t x 70mm Ball Coupling | Electric Trailer Coupling to Suit 70mm Tow Ball
Electric trailer coupling with park brake, designed to suit a 70mm tow ball and rated to 4.5t.
Key Specifications
- CTA approval: CTA-045126
- Ball D-value: 36kN
- Ball V-value: 16.2kN
- Hole spacing: 184mm x 56mm x 16mm
- Maximum torque: 100 ft/lbs
Use four 5/8″ socket head cap screws, torqued to 287Nm. Grade 12 bolts and socket head cap screws are not included.
4.5t electric caravan trailer coupling with park brake is ADR Approved (CTA-045126) and is recommended for use with grade 12 bolts. It is most important that you know the D-Value.
Before purchasing, enter the truck and trailer details below.
If you are purchasing a 70mm Ball Coupling with a D-Value under 23kN, the coupling is underrated.
CM235-Approval-Notice-CTA-045126.pdf
CTA-tested vs. non-CTA-certified towing equipment greatly enhances road safety.
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CTA Road Vehicle Component Type Approval
This coupling has been granted a component type approval under section 177 of the Road Vehicles Standards Rules 2019. The component fully complies with the applicable national road vehicle standards.
CTA Approval CTA-045126 will be available for download upon purchase. Vehicle inspectors may want to see this certificate for registration and certifications.
Purchase a 70mm tow ball with CTA approval here.
Marine Applications
Marine brakes use hydraulic brakes and do not require the park brake attachment on the 4.5t electric coupling. This attachment is for use with electric brakes.
Cutting the brake handle from the coupling is permissible without altering its integrity. Why? The park brake attachment is optional and not part of the testing procedures.
Please note: if you do this, you could void your warranty.
Technical FAQ & Compliance Specifications
ADR APPROVED
Official engineering parameters and regulatory compliance frameworks for the Couplemate 4.5-Tonne (4,500kg) Heavy-Duty Coupling.
The standard mounting footprint matches standard heavy-duty utility layouts to fit standard 70mm tow ball assemblies:
- Hole Configuration:4-Hole industry-standard rectangular matrix
- Hole Spacing (C-to-C):184mm x 54mm (variations up to 185mm x 55mm acceptable)
- Hardware Profile: Suits 16mm (1/2″) high-tensile Grade 12 mounting hardware
- Recommended Plate: Minimum 10mm–12mm thick weldable heavy steel base plate
This coupling is fully legal for use on national highways under the following statutory provisions:
What is a CTA?
A CTA is a certification given to automotive parts that meet applicable Australian Design Rules (ADR) and Road Vehicle Standards (RVS). Each approval is unique to the component, hence why approval is issued as a unique CTA number.
Learn more about trailer and caravan road vehicle compliance here.
Learn specifically about Australian Design Rule 62/02 (Mechanical Connections Between Vehicles) here.
Learn about all relevant Australian Design Rules and other regulations here.
What is a “D-Value”?
- Basically, your D-value tells you how much weight can be transferred to the towbar without the trailer becoming unstable.
- Once the downward weight exceeds your towing part’s recommended D-Value, the D-value product can break. This can have serious consequences.
D-Value Calculation:
T = Total weight of the towing vehicle (GVM)
C = Sum of the axle loads of the central-axle trailer (ATM)
g = 9.81m/s, the gravitational pull/acceleration.
- D-Value can only be calculated with the permissible total weight of both the towing vehicle and trailer.
- Additionally, the calculated D-Value can be equal to or lower than the D-Value of the hitch and of the towing eye.
Is a 70mm coupling’s bolt hole pattern the same as a 50mm coupling’s bolt hole pattern?
- No, a 70mm coupling’s bolt hole pattern is different to that of a 50mm coupling’s.
How do I install this coupling?
- Install a 4.5t electric coupling over the tow ball.
- Remove the nut.
- Tighten the side bolt, then back it off 1/2 turn.
- Reinstall the nut and retighten it.
- This nut puts pressure on the coupling tongue to prevent decoupling.
- Repeat the installation instructions if the 6t electric coupling starts feeling loose.
- It is essentially an “R” clip, a lynchpin, or another suitable device, such as a padlock, placed behind the lower part of the handle.
- Use 4 x 5/8″ Grade 12 bolts of suitable length, washers, and nylocks. It must be bolted to the drawbar and cannot be welded.
Additional information
| Weight | 11 kg |
|---|---|
| Dimensions | 40 × 20 × 20 cm |
| Capacity | 4500kg |
| Tow Ball Size | 70mm |
| Brake Type | Electric |
| D-Value | 36kN |
| CTA Approval | 045126 |
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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