Interactive Bolt Design Program - Java Applet.
Enter the required load. Click on the 'Plot' button, this puts a blue line accross the graph at the required load. To test if a particular bolt size and grade are suitable, enter values in the boxes and click on the 'Calculate' button. For common bolt sizes the coarse and fine pitch values are shown in the text box below the 'Plot' button. Valid inputs for the bolt grade are: 8.8 and 12.9.
The calculated load for any specific bolt input is the 'proof load'. Where cyclic loads are present, allowance should be made for the stress concentration effects caused by the thread form and for other fatigue life reducing factors. Although the plot only goes up to bolt diameters of 30 mm, values for larger bolt sizes can be put in, but the line may not be plotted on the chart.
Return to Notes on Bolted Joints
Return to Module Introduction
David Grieve, 14th September 1999