... , working load 50 kgs,the fast speed,manual operated.Check specification table, 50 kgs with manual operated, use the smallest model RN-0.5T ... (pitch=5mm) enough. Fast speed 1/5.Usually,RN-0.5T jack with ... mm travelThe larger models screw jacks are not suitable for manual operated.NOSEN Projects:Sluice gate in hydroelectric dam,Powered straighteners, ...