Rstewart
Stainless
- Joined
- Jun 14, 2006
- Location
- Huntsville Alabama
We're lookin to have a custom tap made just to clean up slight thread damage we see from time to time. The call out on the drawing is 2 9/16 - 20PPP 2A. I know it's 20 TPI and it's a class 2A thread but what the hell is PPP? Not in the "Book". Any Ideas??