Den påførte kraft skal gå gennem midten af den cylindriske del af den mindste diameter af hovedbolten, hvis diameter er 50,8 mm for klasse H50 (se bilag 5, figur 18). ###>The line of action of the force shall pass through the centre of the smallest diameter of the cylindrical part of the coupling pin having a diameter of 50,8 mm for Class H50 (see annex 5, Figure 18).