conical head

bolt head

bolt head cap wrinkle

bolt head rupture

bolt head with feather

button head bolt

cup head bolt

hexagon flange head bolt

hexagon head bolt

hexagonal head bolt

round head bolt

snap head bolt

square head bolt

hammer head [= hammer head shark]

head to head configuration

head to head structure

effective diameter of bolt or high-strength bolt

3-D conical filtering

3-D conical heat source

4-row conical roller bearing