Bolt Torque Calculator
Calculate recommended torque for bolts based on diameter, grade, lubrication, and joint type.
Bolt Specifications
Nominal bolt diameter
Material strength grade
Lubrication condition
Joint stiffness
Thread Type
Thread pitch series
Recommended Torque
0.0
lb-ft
Clamp Load
0
lbs
Nut Factor (K)
0.000
—
Bolt Grade
Grade 5
Lubrication
Light Oil
Joint Type
Normal
Thread Type
Coarse (UNC)
Torque (Nm)
0.0
Newton-meters
Yield Torque
0.0
lb-ft
Safety Margin
0%
below yield
T = K × D × F (Torque = Nut Factor × Diameter × Clamp Load)
K = 0.20 (dry), 0.15 (oil), 0.12 (grease), 0.10 (anti-seize)
Clamp load ≈ 75% of proof load for Grade 5