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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, T_s(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, T_s(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, T_s(N.m) = K * F_(N) * d_(m) * (1 – L / 100)

T_s(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 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, T_s(N.m) = K * F_(N) * d_(m) * (1 – L / 100)

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

T_s(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 , 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.

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Screw torque, T_s(N.m) = K * F_(N) * d_(m) * (1 – L / 100)

F_(N)= T_s(N.m) / K * d_(m) * (1 – L / 100)

F_(N) = 2 / 0.2 * 0.008 * (1-0)

F_(N) = 2 / 0.0016

F_(N) = 1250N.

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 Calculator, Formula, Screw Torque Calculation