American Society of Agricultural and Biological Engineers (ASABE) announced completion of ANSI/ASAE S331.6, Implement Power Take-off Drive Shaft Specifications. This standard establishes categories of universal-joint drive shafts with 2 subsets of telescoping members each: one heavy duty and one regular duty. In addition to updating normative references and terminology, this revision includes categories and test parameters for type-4 power take-offs.