On my opinion, according to your screenshots, both German and English are not precise enough because two designations are missing, R and Rc.
ISO 228: Pipe threads where pressure-tight joints are not made on the threads
Example: G 1/2 for internal and external thread.
EN 10226-1: Pipe threads where pressure tight joints are made on the threads - Part 1 : taper external threads and parallel internal threads
Examples:
Taper external thread R 1/2
Parallel internal thread Rp 1/2
EN 10226-2: Pipe threads where pressure tight joints are made on the threads - Part 2 : taper external threads and taper internal threads
Examples:
Taper external thread R 1/2
Taper internal thread Rc 1/2
You are right that it is not clear.
I recommend you to post an idea on https://community.ptc.com/t5/Creo-Elements-Direct-Ideas/idb-p/creoelementsdirectideas
To avoid any confusion, the name in the tables (German, or English, or other) should be :
G (ISO228-1)
R (EN 10226-1)
Rp (EN 10226-1)
Rc (EN 10226-1)
Not recommended to put the national prefix DIN, BS, NF, ... Based on my own experience, this is confusing for non European Union users.
http://kotom.eng.free.fr
