What is the nut factor (K)?

The nut factor is a dimensionless value representing the friction in the bolt threads and bearing face, typically ranging from 0.10 to 0.30.

What units are used for the inputs?

The calculator uses millimeters (mm) for bolt diameter, kilonewtons (kN) for clamp force, and Newton-meters (N·m) for wrench torque.

How does lubrication affect the torque calculation?

Lubrication lowers the nut factor (K), meaning less torque is required to achieve the same axial clamp force compared to dry steel.

Can I calculate the clamp force if I only know the torque?

Yes, select the 'Force from torque' mode, enter your applied torque, bolt diameter, and nut factor to find the resulting clamp force.

Is thread pitch accounted for in this formula?

No, this calculator uses the simplified T = K·F·d formula, which aggregates thread geometry and friction into the single nut factor (K).

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Bolt Torque Clamp Force Calculator

Convert between bolt tightening torque and axial clamp force. T = K·F·d, where K is the nut factor (~0.20 for dry steel). Solve torque from force, or force from torque.

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1 examples

M10 bolt, K=0.20, clamp 50 kN

T = K·F·d = 0.20·50·10 = 100 N·m.

{"result":"T = K·F·d = 0.2·50·10 = 100 N·m.","metadata":{"input":{"mode":"torque","nutFactor":0.2,"clampForce":50,"diameter":10},"result":{"torque":100,"torqueUnit":"N·m"}}}

Inputs

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6 options

SettingsAdjust formats, ranges, numbers, and modes.6

Calculation ModeselectOptionalNut Factor KnumberRequiredDimensionless nut factor. Typical: 0.20 dry steel, 0.15 lubricated, 0.13 with moly.Clamp Force F (kN)numberOptionalAxial clamp force in kN. Required in Torque mode.Bolt Diameter d (mm)numberRequiredWrench Torque T (N·m)numberOptionalApplied wrench torque in N·m. Required in Force mode.Decimal PlacesnumberOptional

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Bolt Torque Clamp Force Calculator

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Key facts

Overview

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Use cases

Examples

1. Determining Torque for an M10 Dry Steel Bolt

2. Estimating Clamp Force from a Lubricated M12 Bolt

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