What are air compressor tanks made of? Support October 30, 2020 20:43 Updated Air compressor tanks are made of steel. Related articles What causes swirl marks? Is there a wait time between shots? Can I put a 1/2" chuck on a 3/8" drill? How can I get parts and service for my Porter Cable product outside North America? What is the motor diameter of the Porter Cable 7815 router? Comments 0 comments Please sign in to leave a comment.