Pintle hook tow ball replacement for 50mm combination Pintle Hitches
Pintle hook tow ball replacement for a 50mm combination pintle hook. Shank diameter can change depending on the type of pintle hook.
Couplemate Trailer Parts manufactures and tests tow balls listed below.
Measure the diameter of the tow ball thread before buying a replacement.
Note: Not all pintle balls are the same. This model includes a 1/2" nut to ensure enough thread to lock the tow ball into position.
Available replacement tow ball diameters are:
- 25mm - 52mm Shank - 45mm Thread Length
- 28.4mm - 56mm Shank - 32mm Thread Length
- 32mm - 62mm Shank - 43mm Thread Length (fine)
- 32mm - 75mm Shank - 43mm Thread Length (fine)
- Coarse 32mm - 62mm Shank - 48mm Thread Length
Heavy Duty Towball testing at Couplemate
The Australian Standard requires 3.5t tow balls to be tested with a horizontal force of 85kN or approximately 8.5t.
Pintle Hook balls are rated to 3500kg. Higher ratings to 4500kg pintle hooks are not available at this time. However, they may be available at some point in the future.
Also, review combination pintle hook ball protectors to prevent excessive wear and tear.
How to Break a 3.5t Tow Ball
This is a good example of what can occur for trucks over 5t using 50mm Pintle Combinations.
Reversing a truck onto the ring coupling is not as easy as it seems.
Trucks crashing ring coupling into the tow ball will cause the tow ball to break.
Reversing into the ball causes shock loading in excess of 3.5t and more likely 8.5t or greater.
Tow balls do not break unless used at loadings in excess of the rating or incur shock loading.