Incazelo emfushane:

Umphetho wangaphandle wekhanda lesikulufa le-hexagon socket head bolt uyindilinga, futhi umaphakathi uyi-concave hexagonal, kanti i-bolt enezinhlangothi iyona enamakhanda wesikulufa ajwayelekile anemiphetho eyi-hexagonal. Ngemuva kokushiswa kwendawo yokushisa okushisayo, umphumela wokulwa nokugqwala utholakala.