I am using solid edge version 18, I have a special threaded hole size (11.875-6 ns-3 thread ). how can I implement this into solid edge to use on part & draft file.
You need to find your holes.txt file and add it in.
Depending how your Solid Edge is set up will depend on where this file is, C:\Program Files\Solid Edge V18\Program by default I believe however ours is configured so that everyone looks at a common write protected file on the server.
To add it in you need nominal diameter; internal minor diameter; external minor diameter; thread type
e.g. 0.7500; 0.7229; 0.7193; .750-40 UNS-
(we put the dash but leave off the class so we can use it on both internal & external threads, we add the class in the draft callout)