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How to Auto Calculate Truck D-Value

by | Apr 28, 2019 | Technical Guides | 0 comments

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.

The D-value is calculated with the permissible total weight of both the truck and trailer. The D Value equation is below however, we do have an easy-to-use online solution for calculating D-Value.

First, let’s look at the rating on the coupling or pintle hook. We discovered this rating bears no relationship to your tow vehicle or your trailer.

However, the 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 pintleWe 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 multiple choices 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 and then enter in your truck’s total weight GVM and the weight of the trailer ATM.

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

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

Suppliers should also be able to provide a vertical load value or V-Value.

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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