A bolt is a rod with a head on one end and a helical groove on the other end. Bolts are commonly used for the detachable connections of machines and structures’ parts with the aid of a nut.
Bolts use a wide variety of head designs: multi-faceted, more often hex, or irregular shaped head (semicircular, countersunk, terminal, insert, butt et al.).
GOST: 7798-70, 7805-70 et al.
Bolt 7798 70, GOST 24379.1-80, GOST 52644-2006 Custom manufacturing