Changing the 'Thread designation' column can cause spreadsheet errors, so it is best to avoid this. The thread designation can be changed in the Thread.xls spreadsheet by changing them in the column 'Custom Thread Designation'. To reorder the list, change the number so that your most commonly used is 1 ('Sort Order-1'), working upwards. In the thread.xls in cell D1 it has 'Sort Order-#'. If you are using one thread type and having to select down the list every time, you can change this so that the one you use most frequently is at the top of the list.

Once in this folder location, go to: XLS - en-us - then open Thread.xls.

If you are unsure as to the whereabouts of this location, load up inventor and go to: Get Started - Projects - on the active project scroll down to Folder Options - hover over Design Data. Initially, you will need to locate your design data folder. If you are looking to edit the spreadsheet you can: The thread sizes in Autodesk Inventor are drawn from a spreadsheet of standard thread types and sizes.

Acme threads autodesk inventor 2015