Making tech drawings for parts

Need the Total OAL ?
Length of 1/2-20 threading ?
Width and Diameter of shoulder behind threading ?
Bore diameter within 1/2-20 threading ?

The .600 at barrel end , I.D. or O.D. ?
Need BOTH specifications noted.

Is the I.D. slipping over barrel shouldered at some depth ? or does it continue all the way up to the shoulder behind threading ?
Placement of air venting slot as well width and length required ?

Ex machinist ... sorry

Following the drafting theme of the original post, for those who are interested, there's some very capable free software available as a front-end to 3d printers and Computer Numerical Control (CNC) machines.

I was a Draftsman way before the politically correct term Drafts-preson came in vogue. Started on a drafting board and got dragged along with computers to work with various Computer Aided Design (CAD) and Computer Aided Manufacturing (CAM) programs that were extremely expensive for a license.

These days, for 2d stuff, InkScape is very capable, for 3d parametric modeling FreeCAD V1 is great. The learning curve is steep on both of these open source programs. Lots of tutorials on YouTube but you can be productive after learning a bit of the basics.

Cheers!

At this point in my life, nearly all the machining projects are One Off's ... my sketch blueprints are scribbled onto my electronic note tablet ... once done push refresh button and Presto all gone.