Inkcazo emfutshane:

Umda wangaphandle wesikrufu sentloko ye-hexagon socket head bolt is round, kwaye umbindi ulingana ne-hexagonal, ngelixa i-hexagonal bolt yeyona eneentloko ezixhaphakileyo zokujija ezinemiphetho enamacala amathandathu. Emva unyango umphezulu galvanizing komhlaba, isiphumo anti-umhlwa iyafezekiswa.