Tang threadfastening and forced lock nut fastening.
即唐氏螺纹紧固及硬锁紧螺母紧固。
2
The utility model discloses a double threadfastening device.
本实用新型公开了一种双头螺纹紧固装置。
3
A method for producing fiber-reinforced plastic screw-like fastening element including a thread portion and a head having a cross section which is larger than that of the thread portion.