Download Vdi 2230 English Pdf

The following table shows the values of torque and preload at minimum yield strength for the thread sizes M4 up to M68. Torque and preload for one thread size you can see one below each other for the property classes 8.8, 10.9 and 12.9. Five columns with values of torque and preload are shown for the different friction coefficients 0,08 - 0,10 - 0,12 - 0,15 - 0,18.

Considered in the given values is the torsion stress generated by the thread friction µ-th. Because the yield values of torque and preload are given, in case of a torque controlled tightening the real assembling torque values must remain below this value! Assembling torque = 80%.

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90% of given values e.g. The shown thread is coars thread. Instruction for the following calculation sheet for assembly preload and tightening torque acc. Guideline VDI 2230 After the first opening of calculation sheet you will get a protected view, you have to activate / confirm the processing – otherwise a calculation is not possible. The files are virus checked. Then please select with the black arrow keys: Thread size: M 4.

M 68 Thread pitch: 0,5 mm. 6 mm Property class: 8.8. 12.9 Friction coefficient: µ th 0,06. 0,24 For standard thread under „ Info to regular pitch“ (move cursor to F39) you can view a table of thread pitches for the thread range M 4 M 68.

For fine thread you have to select the corresponding value. In the input field D b you have to put in the mean bearing diameter of bearing surface. For standard hexagon bolts you will find a table in the range M 4.

M 68 under „ Info to D b“ (move cursor to F 42) from where you can take the value of D b for the input in the field C44. For special bearing surfaces – flange or cone head e.g.

- D b must be measured or calculated respectively. The load factor „x-% R p0,2“ (E3) is fixed to the value 0,9 because the tables A1. Cracking the code of life movie worksheet answers. A4 in the VDI 2230 are given for load factor 90% also. When you select any other than 90% then this will not deliver an other result - 90% are fixed internally In the calculation sheet you will find the working-sheet „VDI-2230-A1_A3“, which has to be used for shank-bolts.

Here the calculation is performed by the stress-area A s of the thread. The working sheet „VDI-2230-A2_A4“ has to be used for necked-down bolts. Here the cross-section of the reduced shank A T will be used. The torsional load caused by the thread fiction (µ th) – which delivers an additional stress beside the tensile stress - is considered in both working sheets already.