alloy
aluminum
background
building
close
closeup
component
connection
construction
elbow
electronic
energy
engineer
engineering
equipment
factory
flange
gear
gray
heavy
huge
industrial
industry
manufacturing
mechanical
metallic
part
pipe
piping
pitch
power
preparation
rotate
rotating flange
round
spare
sprocket
stainless
steel
system
technology
timing
tooth
torque
transfer
transmission
tube
valve
wheel
white