GOST 7798-1970
Hexagon bolts with wire holes on head
GOST 7805-1970
Hexagon bolts with wire holes on head
GOST 7808-1970
Hexagon bolts with wire holes on head
GOST 15589-1970
Hexagon bolts with wire holes on head
GOST 15591-1970
Hexagon bolts with wire holes on head