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Free online bolt design for combined shear and tension calculator according to IS 800 - 2007. This calculator is for educational purpose only. Get more steel design calculator on dcbaonline.com


  1. This bolt design calculation programme or calculator is for educational purpose only.
  2. Commercial use of the calculator should be done under the responsibility of the engineer.
  3. dcbaonline.com will not be responsible for any misuse of the calculator.
  4. Find more steel design calculators here.


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Bolt design calculation


Bolt design calculation for shear and tension is required when the bolt is subjected to combined shear and tensile stresses.

The loading tab in calculator is to input the design shear load and design tension load both in kilo Newton.

Bolt details:

Bolt details includes the nominal diameter of bolt this is generally represented with a prefix ‘M’ for eg. M16, M20 etc.

The grade denotes the ultimate stress and the yield stress of the bolt. The grade has to be chosen from the dropdown.

Ultimate stress of bolt and yield stress of bolt is automatically calculated however provision is given for the user to input their own values also.

Connection Details:

The connection details includes the type of connection and number of shear planes formed within the connection.

The number of shear plane passing through threaded portion of the bolt is represented by ‘nn’.

The number of shear planes passing through the shank or unthreaded portion of the bolt is represented by ‘ns’.

These two quantities are calculated by programme, however user can input their own values as well.

The pitch and edge distance are also calculated by the programme as per IS 800 – 2007 and can be edited by the user.

Connecting plate details:

Connecting plates can be seen from the diagrams for single shear and double shear.

The plate thickness of plate 1 and 2 are necessary for single shear.

The plate thickness of plate 1,2 and 3 are necessary for double shear.

Packing plate thickness is optional. Depending on which the reduction factor will be calculated.

Reduction factors:

Grip length reduction factor and packing plate reduction factor are considered in the design.

The long joint reduction factor is not considered as the length between the extreme connections is not known and it depends upon the user.

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