Calculation of critical height of nut or length of engagement
for metric ISO threads according to VDI 2230
Attention!
This calculation is only a simplified estimation, and does not replace a detailed design calculation.
Input data
Type of the thread joint
through bolted joint
tapped thread joint
Thread
M3
M4
M5
M6
M8
M8 × 1
M10
M10 × 1
M12
M12 × 1.5
M16
M16 × 1.5
M20
M20 × 1.5
M24
M24 × 2
M30
M30 × 2
M36
M36 × 3
M64
Tolerance class
6H / 6g
Minimum tensile strength of the bolt
MPa
Maximum tensile strength of the bolt
MPa
Minimum tensile strength of the nut thread
MPa
Available height of nut
or length of engagement
mm
Allowable stress
MPa
Calculate
Results
Minimum required
height of nut or length of engagement
mm
Maximum allowable axial force
kN
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