ИСО - 21.040 - Screw threads

ICS	Поле
21.040.01	Screw threads in general
21.040.10	Metric screw threads
21.040.20	Inch screw threads Including Whitworth screw threads Pipe threads, смотри 21.040.30
21.040.30	Special screw threads Including miniature screw threads, pipe threads, etc.