Specifies classification, design, interchangeability of dimensions with tolerances, finish, and marking requirements for a coupling body for 70 mm and 110 mm towballs, which are used for the towing of trailers above 3.5 t in tension and compression. A pull-out test and a dynamic test are given in appendices.RECONFIRMATION NOTICETechnical Committee ME-053 has reviewed the content of this publication and inaccordance with Standards Australia procedures for reconfirmation, it has beendetermined that the publication is still valid and does not require change.Reconfirmed documents cannot be amended, but may be formally revised and a newedition published.Certain documents referenced in the publication may have been amended since theoriginal date of publication. Users are advised to ensure that they are using the latestversions of such documents as appropriate, unless advised otherwise in thisReconfirmation Notice.Approved for reconfirmation in accordance with Standards Australia procedures forreconfirmation on 8 January 2016.The following are represented on Technical Committee ME-053:Australian Industry GroupAustralian Road Research BoardAustralian Trucking AssociationAUSTROADSCommercial Vehicle Industry Association of AustraliaDepartment of Defence (Australian Government)Department of Infrastructure and Regional Development (Australian Government)Institute of Road Transport EngineersMunicipal Works Operations AssociationNational Heavy Vehicle RegulatorNew Zealand Heavy Haulage AssociationNew Zealand Truck and Trailer Manufacturers FederationRoad Transport Forum New ZealandSociety of Automotive Engineers AustralasiaTruck Industry Council