effective diameter of bolt or high-strength bolt

Fastening Bolt， Binding Bolt

reamer bolt [= rimer bolt]

taper bolt [= tapered bolt]

200L uniform barrel

a tempest in a barrel

aggregate weighing barrel

air pump barrel

Aluminum Barrel

amalgamating barrel

arched barrel roof

autofrettaged gun barrel

automatic barrel welder

Axes of gun barrel

axis of gun barrel

baffle clarification barrel

ball bearing core barrel

bare-barrel drum

barred barrel