Thread stripping strength
 Metric size
 Effective length of engagement Le   (0.75d for standard nut) mm
 Material shear strength of weakest part MPa
 
 pitch diameter d0=(d2+d3)/2 mm
 tensile stress area At =π/4 d02 mm2
 shear area Ath = 0.5πd0Le mm2
 Shear strength F = T Ath kN
 Tensile stress σ = F / At MPa
 
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