(1) Model and (4) Gear Ratio Note: For multiple high speed quick lifting screw jacks lifting systems, some bevel gear jacks require left-handed ball screw. However, there are not high(large) leads sizes for left-handed ball screws. Please pay more attention when selection.
(2) Configurations and Designs * US: Upright mount, Translating Screw. * IS: Inverted mount, Translating Screw. * UR: Upright mount, Rotating Screw with lifting nut. * IR: Inverted mount, Rotating Screw with lifting nut. * UK: Upright mount, Anti-rotation Screw (Square tube). * IK: Inverted mount, Anti-rotation Screw (Square tube). * Important Note: The lifting ball screw of a translating screw jack must be attached to the guided load which prevents the lifting ball screw from rotating. To add the linear guides, rails or rolls are recommended. * Important Note: If your application involves a load which is unattached, unguided or the load is free to rotate and not translate, then an anti-rotation screw jack(square tube and nut) are required to prevent lifting ball screw rotation (not recommended). * Important Note: Without self-locking, may lower under load. Brake motors or external locking devices are recommended.
(3) Stroke and (5) Screw End Fittings * Stroke is travel expressed in millimeter(mm) or inches and not the actual screw length. * Standard Screw End Fittings: top plate(load pad), clevis end(male clevis), plain end, threaded end. Also rod end, and fork head(female clevis) are available. Custom screw ends are acceptable.
(6) Input Shaft Codes Note: The gearbox space is limit, except 1S and 2SI type, other types are not suitable for 1:1 ratio, but 2:1 ratio is available for all types.
(7) Ball Screw or Ball Nut Direction of Movement * RHCU: Right-handed Screw. When the input shaft rotates clockwise, the ball screw or ball nut moves up. * LHCD: Left-handed Screw. When the input shaft rotates clockwise, the ball screw or ball nut moves down. Note: When the input shaft rotate counterclockwise, the direction of movement is the opposite.
(8) Additional Accessories * Motorized driven (AC or DC) by asynchronous motors (normal, YEJ brake, YVP variable frequency, B explosion proof, D multi-speed), stepper motors, servo motors with encoders and controllers. IEC motor flange or NEMA C-Face motor adapter for connect with motors. Frequency inverters. * Manually operation by Aluminum handwheels, or Cast iron handwheels. * Connection Devices: Couplings. Universal joints. Telescopic universal joints. Connecting shafts. * Screw Protective Devices: Bellows boot. Telescopic spring covers. Rigid Protective tubes. * Safety Devices: Limit switches. Proximity switches. Safety nuts. Anti-backlash nut. Overload safety couplings. Stop nuts. Position Encoders. Overload clutch. Brake motor. Linear braking elements. Wear detection/monitors. Linear guides and rails. Potentiometer. Pressure sensor. * Others Accessories: Travel nuts. Position indicators. Trunnion adapter plates. Trunnion mounting brackets. Pillow blocks. Flange blocks. Rod end bearings.
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