# Screw Torque Calculator, Formula, Screw Torque Calculation

## Screw Torque Calculator:

Enter the values of Force, F(N), material constant K, lubrication factor, L and nominal diameter d(m) to determine the value of Screw torque, Ts(N.m).

 Enter A Dimensionless Coefficient Representing the Material Constant: Enter Force Applied: N Enter Nominal Diameter: m Enter Lubrication Factor: Result – Screw Torque: N.m

## Screw Torque Formula:

Screw torque is an essential factor in mechanical engineering and construction, representing the rotational force applied to a screw to achieve the desired level of tightness without damaging the screw or the material.

Screw torque, Ts(N.m) in Newton metre is generated by multiplying Nut factor, a dimensionless coefficient representing the material constant K, Force F(N) applied in Newton (N) and Nominal diameter, d(m) of the screw in metres (m). The obtained value is multiplied by Lubrication factor L as a percentage, which is subtracted from 1.

Screw torque, Ts(N.m) = K * F(N) * d(m) * (1 – L / 100)

Ts(N.m) = Screw torque in Newton metre, N.m.

K = a dimensionless coefficient representing the material constant

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F(N) = Force applied in Newtons (N),

d(m)  = Nominal diameter in metre, m.

L = Lubrication factor.

### Screw Torque Calculation:

1. A technician is installing a component using a screw that has a nominal diameter of 0.01 metres. The applied force is 900 Newtons, the nut factor K is estimated to be 0.25, and the screw is lubricated with a substance that provides a 20% reduction in friction. Calculate the torque needed to properly tighten this screw.

Given: K = 0.25, L = 20%, F(N) = 900N, d(m)  = 0.01m.

Screw torque, Ts(N.m) = K * F(N) * d(m) * (1 – L / 100)

Ts(N.m) = 0.25 * 900 * 0.01 * (1 – 20/100)

Ts(N.m) = 1.8N.m.

2. During the assembly of a machine, it is necessary to apply a torque of 2 N.m to secure a screw with a nominal diameter of 0.008 metres. The nut factor K is 0.2, and the assembly is performed without the use of lubrication (0%). Calculate the force that needs to be applied to achieve this specific torque.

Given: K = 0.2, L = 0%, Ts(N.m) = 2N.m, d(m)  = 0.008m.