ISO 6489-4:2004规定了牵引式非平衡挂车和配备有ISO 5692-1中规定的连接环的机具与农业牵引车连接时使用的皮顿式连接装置的尺寸要求。其目的是确保农业牵引车上机械连接的互换性。仅适用于垂直静载荷不超过30 kN的情况。

ISO 6489-4:2004 specifies the dimensional requirements for the piton-type coupling devices used in the attachment to agricultural towing vehicles of towed, non-balanced trailers and implements equipped with a coupling ring specified in ISO 5692-1. Its purpose is to ensure the interchangeability of the mechanical connections on agricultural towing vehicles. It is applicable only in those cases where the vertical static load does not exceed 30 kN.