Bolt Connection Calculators

One-bolt Clamp Tightening

In this calculation, a bolted clamp attached to a shaft with a diameter D is considered. The shaft is under the action of torque T and kept from slipping by the frictional force generated by the torque of the fastening bolt, located at a distance l₁ from the shaft axis. As a result of calculations, the tightening force F ensuring the operability of the connection is determined.

For the calculation, the friction coefficient of the contacted surfaces μ and slot dimension b (look at figure) should be specified.

The tightening torque of the thread can be calculated here.

Calculation of Tightening Force of the One-bolt Clamp under Torque

Tightening Force calculation of the One-bolt Clamp

INITIAL DATA

D - Shaft diameter;

l₁ - Distance from the shaft axis to the bolt;

b - Distance from the shaft axis to the slot end;

T - Torque;

μ - Coefficient of friction on the clamping surface.

RESULTS DATA

F - Tightening force.

Metric Imperial

Diameter (D)

Distance (l₁)

Distance (b)

Torque (T)

Friction coefficient (μ)

Tightening force (F)

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BASIC FORMULAS

Tightening force:

F = 1.2*T*b / μ*D*(l₁ + b)

INITIAL DATA

D - Shaft diameter;

l₁ - Distance from the shaft axis to the bolt;

b - Distance from the shaft axis to the slot end;

T - Torque;

μ - Coefficient of friction on the clamping surface.

RESULTS DATA

F - Tightening force.

COEFFICIENTS OF FRICTION

Friction contact materials	Surface conditions	Friction coefficient
Steel-Steel	Dry	0.15
Steel-Steel	Greased	0.11
Steel – Cast iron	Dry	0.3
Steel - Copper	Dry	0.36
Steel - Copper	Greased	0.19
Steel - Bronze	Dry	0.12
Steel - Bronze	Greased	0.09
Steel - Brass	Dry	0.35
Steel - Brass	Greased	0.19
Steel - Titanium alloy	Dry	0.3÷0.7
Steel - Aluminium alloy	Dry	0.61
Bronze - Bronze	Greased	0.1
Cast iron - Bronze	Dry	0.22
Cast iron - Bronze	Greased	0.08
Cast iron – Cast iron	Dry	1.1
Cast iron – Cast iron	Greased	0.1
Aluminium alloy - Aluminium alloy	Dry	1.2
Aluminium alloy - Aluminium alloy	Greased	0.3
Titanium alloy – Titanium alloy	Dry	0.5

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