50mm High Shoulder Towball
50mm High Shoulder Towball is a high tensile tow ball. Suits Al-ko, Ark and Hyland Hitch off-road couplings
- 25mm Shoulder.
- 52mm or 62mm Thread length.
- 22mm diameter UNF thread to suit most tow bars.
- High tensile
The high shoulder allows great articulation of off-road couplings over standard equipment.
Overseas manufacturing in China and other places, it is unusual to find Australian made goods. I am so proud we can manufacture this product for you.
In our opinion, these high tensile tow balls are the best on the market and a great investment.
Standard tow balls can touch and put a lot of force on the edge of the receiver bar and may cause coupling, tow ball and chassis damage.
Couplemate tow balls have been tested to comply with AS4771.2 where balls are tested to 85kN and held at 85kN for a period of not less than 10 sec. You may find this video interesting. Watch the computer monitor in the background.
What is 85kN? (8667.59kg). Yes, 3.5t tow balls must satisfy the Australian Standard and be tested to a min standard of (8667.59kg).
Tow Ball Scales
Your coupling weight is critical to your rig running true and braking correctly. Too much tow ball weight overload your tow vehicle and make it overrun its braking ability.
Tow coupling weight ball scales help you identify how much weight you should move back onto your trailer axles thereby lightening the load on your tow bar.
The correct weight and a level chassis play a huge role in effective and efficient towing, Click the image to add tow balls scales to your shopping cart.
For the 3,500kg and a true rating performance, we use high tensile steel and this is where these tow balls become costly.
Couplemate tow balls are guaranteed for life. If your Couplemate high tensile tow ball fails you for any reason, we will replace it.
High Tensile 25mm High Shoulder Tow Ball
3500kg high shoulder tow balls are manufactured in Australian by Couplemate. Thank you for your support.
A standard shank tow ball has a shoulder of approximately 12.5mm. This size shank fits all highway couplings except some off-road couplings.
The Al-ko, Ark and Hyland off-road couplings foul the tow bar tongue when towing through gullies or river beds on an angle. There is possible damage that could be caused to your towing equipment using a normal size shoulder on a tow ball.
Couplemate developed a high tensile tow ball to allow the full rating of 3500kg to be issued to this tow ball. In fact, a much higher rating is achievable due to the grade of high tensile we used.
Galvanising and Plating
Galvanising and plating is a big issue when talking about “but will it be strong enough”
There has been a fair amount of research on galvanising and spring weakness due to the galvanising process. Click here for the full report.
So will galvanising or plating affect my product strength?
Yes, strength tests in the full test report above states strength reduce the product rating by 0.4%, The tolerance here we would take notice is 1%.
In effect, there is no negligible effect on product load rating. Click this link to read our article on galvanising.
How can I be sure my the ball rating will not be affected by galvanising?
A Good question deserves a good answer.
Couplemate tow balls are tested to AS 4177.2—2004 after being plated.
Also required as part of testing is a certificate that the coupling balls have undergone a de-embrittlement process.
Finally, so you have read about embrittlement right? Certificates are required with each batch to ensure products are free of hydrogen embrittlement.