... equipment, simulation equipment and so on. "ELITE" SJ series screw jack has advanced design,high quality housing and compact aluminum gear ... space requirements and toughest industrial environment."ELITE" SJ series screw jack can be installed vertically (upward, downward), horizontally or in ... CoverDust CoverLimit SwitchSafety NutBlock NutAnti-turn DeviceBacklash Device Screw Jack for Boiler