Bolt Tightening of a Bar Mounted Clamp | Online Calculator

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.

Diameter (D)

Distance (l1)

Load (P)

Friction coefficient (μ)

Tightening force (F)

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

Greased

0.11

Steel – Cast iron

Dry

0.3

Steel - Copper

Dry

0.36

Greased

0.19

Steel - Bronze

Dry

0.12

Greased

0.09

Steel - Brass

Dry

0.35

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

Greased

0.08

Cast iron – Cast iron

Dry

1.1

Greased

0.1

Aluminium alloy - Aluminium alloy

Dry

1.2

Greased

0.3

Titanium alloy – Titanium alloy

Dry

0.5

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