Tensile Strength of Metric Nuts
Indicated stresses in Newton/mm2
In accordance with BS 3692:2001
The designation system allows the determination of the ultimate and yield Strength/proof strength of the bolt. The designation system is based on two numbers e.g 8.8. The first number is the tensile strength of the bolt material (N2 )/100. The second number is = 1/100.(the ratio of the Proof (or Yield ) stress and the Tensile strength expressed as a percentage = 100.[Yield (Proof stress) /Tensile strength] /100
The tensile and proof strength of the steel for a 4.6 bolt is therefore calculated as follows
Tensile strength (Rm) = 4.100 N/mm2 = 400 N/mm2 .... Proof strength (R0,2) = 0,6*400 * 100 /100 = 240 N/mm2
|
