This standard BS ISO 5692-3:2011 Agricultural vehicles. Mechanical connections on towed vehicles is classified in these ICS categories:
65.060.10 Agricultural tractors and trailed vehicles
This part of ISO 5692 specifies the requirements for hitch rings used for the attachment of agricultural trailers and implements to the rear of self-propelled agricultural vehicles equipped with a non-swivel clevis coupling as specified in ISO 6489-5.