Available in the diameters ranging from M5 (5mm) to M60 (60mm). However, 6mm threaded rod (also known as M6 threaded rod), 8mm threaded rod (M8 threaded rod), 10mm threaded rod (also termed as M10 threaded rod), 12mm threaded rod (M12 threaded rod) are most often used in the HVAC sector. The length of these threaded rods (also known as threaded bars) ranges from 1 meter to 3 meters. The finish or coating is generally Electro zinc plated.