Bolt Connection Calculators

Bolt Tightening of a Bar Mounted Clamp

In this calculation, a bolted clamp attached to a bar with a diameter D is considered. The bar is under the action of an axial force P and kept from slipping by the frictional force generated by the torque of the fastening bolt, located at a distance l₁ from the bar 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 should be specified.

The tightening torque of the thread can be calculated here.

Tightening Force Calculation of the Lever under Axial Load

Tightening Force of the clamp Under Axial Load

INITIAL DATA

D - Bar diameter;

l₁ - Distance from the bar axis to the bolt;

P - Load;

μ - Coefficient of friction on the clamping surface.

RESULTS DATA

F - Tightening force.

Metric Imperial

Diameter (D)

Distance (l₁)

Load (P)

Friction coefficient (μ)

Tightening force (F)

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BASIC FORMULAS

Tightening force:

F = 1.2*P*D / μ(2l₁ + D)

INITIAL DATA

D - Bar diameter;

l₁ - Distance from the bar axis to the bolt;

P - Load;

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

OTHER CALCULATORS

AREA MOMENTS OF INERTIA

BEAM CALCULATORS

TORSION OF BARS

CIRCULAR FLAT PLATES

BUCKLING

ELASTIC CONTACT

IMPACT LOADS

NATURAL FREQUENCIES

PRESSURED SHELLS

FLUID DYNAMIC

COMPOSITES

SPRINGS

THREAD CONNECTIONS

SHAFT CONNECTIONS

BEARINGS

DRIVES

FATIGUE

HEAT TRANSFER