This International Standard specifies the dimensions and location of a ball-type coupling device of 80 mm nominal diameter, whose male part fitted to an agricultural towing vehicle and female part fitted to a towed, non-balanced vehicle provides mechanical connection between the two vehicles, where the downwards vertical static load does not exceed 40 kN.
ASAE/ASABE AD24347:2005 (R2018)
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Agricultural Vehicles – Mechanical connections between towed and towing vehicles – Dimensions of ball-type coupling device (80mm)
The American Society of Agricultural and Biological Engineers , 06/01/2014