43.040.70 - Couplings

This document specifies the characteristics necessary for the mounting and interchangeability of clevis couplings on the frame (cross member, drawbeam or mounting bracket) of towing vehicles for trailers. This document is applicable to clevis couplings intended for connection to trailers equipped with a drawbar eye on the drawbar of the trailer. Characteristics not specified are left to the discretion of the component manufacturer.

ISO 13044-2:2013 specifies the mechanical, electrical/electronic and pneumatic characteristics of a fully automated fifth wheel coupling system to ensure interchangeability between a tractor vehicle and a coupled semi-trailer(s) with 24 V nominal supply voltage. The two vehicles together constitute an articulated vehicle. ISO 13044-2:2013 also supports the smooth introduction of fully automated fifth wheel coupling systems in the market. It specifies features necessary for mixed mode operation; ...view more

ISO 18868:2013 defines different multiple-vehicle combinations (vehicle combinations with more than one coupling point) and the formulae to calculate the requirement of performance for the coupling equipment used in those vehicle combinations. Vehicle categories concerned are N2, N3, O3, and O4.

ISO 7641:2012 gives a simplified procedure for the calculation of the mechanical strength of steel drawbars, whether there are welds or not, for centre-axle trailers Categories O1 and O2 as specified in the UNECE, Consolidated Resolution on the Construction of Vehicles (R.E.3). Consequently, it only applies to simple constructions that enable a calculation in bending.

ISO 1726-3:2010 specifies the test conditions of a static test to be performed on the semi-trailer contact area to the fifth wheel. It ensures the ability of the semi-trailer to couple the greatest possible variety of tractor vehicles equipped with a fifth wheel coupling in accordance with ISO 3842.

ISO 1103:2007 lays down the dimensions necessary for the compatibility of mechanical coupling devices between light trailers or caravans and towing vehicles, when the latter are fitted with a coupling ball. The clearance space around the coupling ball is intended to allow coupling and decoupling of towed vehicles, as well as safe operation during coupling and uncoupling of mechanical devices. ISO 1103:2007 applies to coupling balls designed to couple caravans and light trailers of categories O1 ...view more

ISO 12357-2:2007 lays down test conditions and strength requirements to be met by: drawbar couplings and corresponding drawbar eyes for rigid drawbars which are provided for use on rigid drawbar trailers with a maximum design total mass exceeding 3,5 tonnes and a vertical static load exceeding 10 % of their design total mass, and/or a vertical static load greater than 1 000 kg and up to 2 000 kg; drawbar couplings and corresponding drawbar eyes for use on vehicle transport combinations, provided...view more

ISO 1726-2:2007 specifies dimensions to ensure interchangeability between a low coupling height tractor vehicle and a coupled high-volume semi-trailer, the two together constituting a high-volume articulated vehicle. It specifies certain interchangeability dimensions, including those of the optimised gooseneck contour, as well as operating dimensions related to angle values. The specifications are primarily intended to permit semi-trailers to be coupled with two-axle tractors. However, three-axl...view more

ISO 3842:2006 lays down the dimensional characteristics necessary for mounting and interchangeability of the fifth wheel mounted on a mounting plate or directly on the frame of towing vehicles for semi-trailers. It applies to the fifth wheels intended to hitch on semi-trailers equipped with a: 50 coupling pin as defined in ISO 337; 90 coupling pin as defined in ISO 4086. Dimensions not specified are left to the discretion of the component manufacturer. Test conditions and strength requirements t...view more

ISO 18207:2006 defines a simplified and reliable check procedure of the mechanical coupling devices between light trailers and towing vehicles, covered by ISO 3853 and European regulation (94/20/CE), which specify a dynamic test of mechanical resistance at the conclusion of which these devices should present neither fractures, splits, cracks, nor visible external deteriorations caused by the test. ISO 18207:2006 is applicable to all the components of the mechanical coupling devices whose failure...view more

ISO 11407:2004 specifies the interchangeability requirements -- the various elements and dimensions -- for the mechanical coupling of towing vehicles whose coupling is mounted forward and below to centre-axle trailers. It is applicable to road trains for the commercial transport of low-density, high-volume cargo of the greatest possible variety. It is also applicable to corresponding equipment in cases where the same vehicle makes up part of a road train having more than one trailer. It is not a...view more

ISO TS 20825:2003 specifies the maximum allowable wear and the limit dimensions of worn components of in-use mechanical couplings, which, when respected, will ensure the safe operation on the road of the heavy commercial vehicles fitted with such couplings. It is applicable to 40 mm and 50 mm drawbar couplings, 40 mm and 50 mm drawbar eyes, 50 mm and 90 mm fifth wheel kingpins, and hook couplings and toroidal eyes.

This International Standard specifies strength test conditions and requirements for the 40 mm and 50 mm drawbar couplings and corresponding drawbar eyes for hinged drawbars. NOTE See ISO 3584 [1] for couplings, and ISO 1102 [2] and ISO 8755 [3] for eyes.

This International Standard specifies strength test conditions and requirements for 50 and 90 fifth wheel kingpins. NOTE See ISO 337 [1] and ISO 4086 [2].