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ISO 337:1981
Road vehicles - 50 semi-trailer fifth wheel coupling pin - Basic and mounting/ interchangeability dimensions
This second edition cancels and replaces the first edition (1973). Specifies the dimensions of the 50 coupling pin /dia. 50,8 mm (2 in)/ which is used for coupling semi-trailers to prime movers, taking into account the limitations of weight generally laid down by official requirements. Some figures illustrate shapes and the difference of types.
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International Organization for Standardization [iso]
