Maximum tensile loading
 Metric thread : -
 Initial tensile stress : σt = ĚRp0.2
 
 pitch P mm
 pitch diameter d2 mm
 root diameter d3 mm
 tensile stress area At =π/4 d02 ; d0=(d2+d3)/2 mm2
 ultimate tensile strength Rm  MPa
 yield strength Rp0.2 MPa
 initial tensile stress σt = α Rp0.2 MPa
 Initial load Fi = At σt kN
 Load at Yield F0.2 = At Rp0.2 kN
 Load reserve Pb=F0.2 - Fi kN
 
www.tribology-abc.com