This permanently lubricated, heavy-duty, double-acting air cylinder is designed for applications requiring guided movement when it is critical that the piston rod not rotate. 2 piston rods prevent rods from twisting and turning off the axis, for reliable, repeatable linear motion with no need for external guides. Cylinder bearing wear is also minimized by the nonrotating twin-rod design. High-tensile strength aluminum cylinders have chrome-plated polished steel piston rods, high-strength steel tie rods, cast-iron rod bearings, and U-cup piston cylinders. Noncushioned and not swtich ready.