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