ÖNORM EN ISO 2320

This International Standard specifies the mechanical and performance properties for prevailing torque type steel hexagon nuts (including those with flange) when tested over an ambient temperature range of 10 C to 35 C . Properties will vary at higher and lower temperature. It applies to prevailing torque type nuts with nominal thread diameters up to and including 39 mm; of triangular IS0 thread according to IS0 68; with diameter/pitch combinations according to IS0 261; with thread tolerances 6H according to IS0 965-2; with specific mechanical requirements; with dimensions as specified in product standards provided they make reference to this International Standard; within the temperature range -50 C to +300 C for all metal type nuts; within the temperature range -50 C to +20 C for non-metallic insert type nuts. It does not apply to nuts requiring special properties which may require special materials or coatings to improve weldability; corrosion resistance; performance outside the above specified temperature ranges. Prevailing torque performance decreases with increasing re-use. The nut user should consider the implications of decreased performance prior to re-use.