ISO 5673-2:2005给出了用于农业的拖拉机和自行式机器的（PTO）驱动轴的形式和应用，并规定了各种附件的机具功率输入连接（PIC）的尺寸和周围的间隙区域。其目的是确保当机具和拖拉机的功率水平兼容时，PTO驱动管路与机具和拖拉机上的相邻部件之间有适当的间隙。它不是驱动线设计的完整指南，例如，它不包含有关防止驱动线振动或确定扭矩限制装置尺寸的信息。它不适用于带有高离地间隙拖拉机的机具组合，例如在直立蔬菜作物或甘蔗上工作的机具，也不适用于设计用于低离地间隙的农业拖拉机，例如割草或地面护理的拖拉机，这些拖拉机需要较低的重心；它也不适用于非执行机构- 由于其功能，在设计上必须对称。

ISO 5673-2:2005 gives the forms and applications of (PTO) drive shafts for tractors and self-propelled machines used in agriculture, and specifies the dimensions for, and clearance zone around, the implement power-input connection (PIC) for a variety of attachments. Its intent is to ensure proper clearance between the PTO drive line and adjacent components on the implement and tractor when both implement and tractor have compatible power levels. It is not intended as a complete guide for drive-line design and does not, for example, contain information on preventing drive-line vibration or sizing a torque limiting device. It is not applicable to combinations of implements with tractors having high ground clearance, such as those working in standing vegetable crops or sugar cane, nor to agricultural tractors designed for low ground clearance, such as for lawn mowing or ground care, which require a low centre of gravity; neither is it applicable to implements non-symmetrical in design by necessity due to their function.