This 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 degree C to 35 degree 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 ISO thread according to JIS B 0205 or JIS B 0207; - with diameter/pitch combinations according to JIS B 0205 or JIS B 0207; - with thread tolerances 6H according to JIS B 0209 or JIS B 0211; - with specific mechanical requirements; - with dimensions as specified in product standards provided they make reference to this Standard; - within the temperature range -50 degree C to +300 degree C for all metal type nuts; - within the temperature range -50 degree C to +120 degree 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.

JIS B 1056:2011

ISO 2320:1997 - Identical