Table A7 describes a hypothetical bolted joint as an example of how you make an estimate.The determination of external loading does not form part of the VDI 2230 guideline. whether it is concentrically applied, whether it is an alternating load, etc. You also need to know something about the type of external load, e.g.To start, you need to know the magnitude of the external applied load (Step A).It is a rough guide only, and forms the starting point for the VDI 2230 calculations.This is a good starting point for many joints, and may be useful as a check on whether a bolt is failing because of wrong selection of size and strength.Table A7 gives a rough estimate of the appropriate bolt size for a given bolted joint.VDI 2230 is one of the common methods of design used for bolted joints, often in combination with FEM.History shows that some bolts are underdesigned, resulting in service problems, sometimes disastrous.

Many bolted joints are over-designed, and this can result in excess weight in the structure being assembled.VDI 2230 ‘Systematic Calculation of High Duty Bolted Joints’ Method developed by the German Society of Engineers that allows the determination of the diameter and strength of bolts to withstand the applied working loads without risk of premature failure

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