Mill-type cylinders by torque are developed to meet the demand for a more strong and reliable product in order to save downtime and maintenance cost. The mill-type cylinder has heavy-duty construction with steel flanged end caps, heavy-wall steel tubing, bigger pistons, bearings, enhanced gland design, and multiple other characteristics based on design standards that are not subject to NFPA constraints. The mill-type cylinder has a high pressure rating that exceeds industrial norms. These traits, when combined, ensure better dependability under the most adverse climatic and operating situations.