Drum Diameter & Bending Stress Calculator Wire Rope Size: 8 mm (6x19) 10 mm (6x19) 12 mm (6x19) 14 mm (6x37) 16 mm (6x37) 18 mm (6x37) 20 mm (6x37) Lifting Load (kg): Reeving Ratio: 2:1 4:1 6:1 4:2 6:2 8:2 10:2 12:2 16:2 20:2 24:2 Duty Class (ISO): M3 M4 M5 M6 M7 M8 Drum Material: Steel S235 Steel S355 Cast Iron GG20 Aluminum 6061-T6 Calculate Drum Diameter & Safety