Calculate D-Value for Towing Equipment on the Truck | Trailer

D-Value is one of the most understood calculations in the truck and trailer industry. We will try and make it easy with a little technology and science.

First, let’s look at the rating on the coupling or pintle hook. We discovered this rating bears no relationship to your tow vehicle nor your trailer.

However, combination pintle hook rating has a direct relationship to the tow ball. Tow balls are tested to a very specific rating according to AS4177.2

low wear truck pintleIf you click on this link, it will open in another tab for quick reference.

We are now looking at the CM255, a Pintle Ring Coupling rated at 6t. Soon you will be like me, asking what the 6t rating refers to.

The form below gives the user a multiple choice to ensure the correct device is selected.

New Automatic Calculation Methods

Customers unsure of how to calculate D-Value methods should go to the form calculation then enter in your truck GVM and the Trailer ATM.

The calculation field equation below has been inserted into a radio button and shows how to auto calculate d-value.

Once you have the calculated based in the form of a D-Value then you can select the towing product?

Products with NO D-Value are illegal to be used on the road.

D-Value Equation

D-Value = 9.81 x (Tow Vehicle GVM x Trailer ATM) / (Tow Vehicle GVM + Trailer ATM)

If you do the equation, a 12t truck tow an 8t trailer has a D-Value of 47Kn. Click the D-Value Sheet here for confirmation

So now we are all aware of how easy it is to select the correct pintle hook, can you tell me the relevance of the rating stamped on a product?

Finally, purchase towing equipment here.

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