What is the BAS thread and pitch?

[scythefwd]

Have a machinist that is gonna send me a shortened BAS replacement for when I do the bolt lift mod... he needs to know the size and details of the screw. I can get length, and head diameter, but the thread and pitch I'm lost on.. anyone happen to know what it is off the top of your head?

[drybean]

1/2 x 28

drybean

[scythefwd]

Thank you sir.