bolt head

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

effective diameter of bolt or high-strength bolt

hammer head [= hammer head shark]

head to head configuration

head to head structure

3-D bolt element

3-pieces bolt connected tightening frame

45Mn2 bolt

a bolt