Việt
Chân ren
Anh
thread root
Đức
Gewindegrund
Gewindekern
Pháp
fond de filet
chân ren
thread root /INDUSTRY-METAL/
[DE] Gewindegrund; Gewindekern
[EN] thread root
[FR] fond de filet
thread root /ENG-MECHANICAL/
[DE] Gewindegrund