This International Standard specifies the mechanical properties of nuts with specified proof load values, - with nominal thread diameters up to and including 39 mm (or 100 mm); - of triangular ISO thread and with diameters and pitches according to ISO 68 and ISO 262 (coarse thread); - with thread tolerances 6H according to ISO 965; - with specific mechanical reqirements; - with width across flats as specified in ISO 272 or equivalent; - with nominal heights greater than or eguel to 0,5 D; - made of carbon steel or low alloy steel.