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The calculation permits use of the complete scope of VDI 2230, (1990 and 2003). For example the complex examples of VDI 2230 (1990 or 2003) can be easily reproduced.

Tables are integrated for all applicable elements, such as bolts in accordance with EN ISO 4762, 4014, 4017, 1207, 8765, 8676, EN 1662, 1665, standards for bores, washers, nuts, etc. Separate definitions of bolts of almost any complexity, even banjo bolts are possible.

Plates, sleeve, segments, or prismatic bodies can be defined as tensioned elements. The program is capable of executing recommendations for nominal diameter and thread length.

The default pretension force is configured as 90% of the limit of elasticity, this can be changed via the setting possibilities. Calculations with specified tightening torque or pretension force can be executed. The data is output for the status with minimum pretension force (tightening factor 1.0), the maximum pretension force, and for the selected utilization of the limit of elasticity.

The graphic display of the resiliance diagram and of the bolt geometry is shown on the screen and can be printed out or output to a CAD system.

Eccentric resiliance and stress, configurations

In addition enables consideration of eccentric stress and resiliance and checks for divergence of the separating joint.


Individual bolts can be defined and handled under longitudinal force, transverse force, flange connections with turning and bending torque and console connection with any bolt position.

Minimum depth of engagement and resistance to stripping

In order to determine the minimum depth of engagement of bolts, the resistance to stripping of bolt and nut thread, can (in accordance with chapter 5 of VDI 2230) be calculated under consideration of nut divergence and plastic deformation.

Bolt calculation at high and low temperatures.

Usually bolts are mounted at ambient temperature. However the influence of operating temperature on the pretension status of the bolt, and hence on the resistance of the connection is considerable. When bolting light metal materials with steel bolts, for example, the conditions change significantly even at operating temperatures of 70 degrees! The extension of the KISSsoft bolt calculation now permits calculation of bolt connections even at operating temperatures between - 200 and +1000 degrees Celsius using the calculating guideline stipulated in VDI 2230. Different temperatures can be specified for bolts and resilient parts.

In addition, temperature dependency of the elasticity module, the thermal expansion coefficient, the limit of elasticity, and the permissible contact of the materials are also taken into account.

The threaded joint is checked for mounting status at room temperature, as well as for stationary or instationary status at operating temperature for all criteria (in accordance with VDI 2230: pretension force, bolt force, durability, and surface contact).

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