標準號：IS 12605-1989
發布日期：1989/8/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard Jays down the strength require-ments to be met by mechanical coupling devices between trailers and towing vehicles. These devices may be of the following types:a) One-piece ball coupling, andb) Ball coupling comprising of a number of parts which can be dismantled.NOTE — The term 'ball coupling' is used to desig-nate a coupling device of which a 'coupling ball' forms a part.1.2 This standard is applicable to towing brackets and coupling balls fitted to towing vehicles intended for towing of the trailers of which the maximum total weight does not exceed 3-5 tonnes. In the case, where exceptionally, the manufacturer of the towing vehicles authorizes the maximum permis-sible towed weight to be exceeded, the corres-ponding towing devices are not considered in this standard.