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Here is a parametric nut detail item for you. I couldn't find this in the imperial library, so I made one. You input the Rod Diameter and all the rest of the dimensions update. There is an optional masking region and optional washer (instance parameters). 

The dimensions are all based on the proportions of a nut for a 1-inch rod. The height of the nut is equal to the diameter of the rod. The washer is always 1/8" wider than the nut. I know actual nut and washer dimensions don't scale perfectly from that, but this worked for my purposes. If you need precise dimensions, you could just edit the family, take out the equations for the parameters and put in dimensions manually to save your types. 

Just beware if you do that, DIM2 and DIM3 need to be correct or the arches will mess up. I'd measure that first (in proportion to Rod Diameter) Before you changed them. 

Product Version: Revit Structure 2018

Uploaded By: annieruth7
Uploaded On: Thu, Nov 5, 2020