There is an ISO standard but many attachments DO NOT have the "standard" dimension. The companies either could not meet the standard because of requirements of their equipment drives of just did not bother with it. Also it depends on the age. The ISO standards did not become finalized and accepted until the mid 1970s. Even then companies did not adopt them on the current equipment but waited until "NEW" models where designed. AN example would be the ISO/pioneer hydraulic couplers. These did not become universal until the early 1980s.
Here is a link to the ISO site where you can purchase the actual standards for PTO dimensions.
ISO 500-1:2014 Agricultural tractors -- Rear-mounted power take-off types 1, 2, 3 and 4 -- Part 1: General specifications, safety requirements, dimensions for master shield and clearance zone
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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