The right screw jack and bevel gearbox manufacturer should be selected by matching the complete transmission system to your load, travel, speed, duty cycle, installation environment, and integration requirements. I recommend defining these parameters before comparing prices or catalog dimensions. A screw jack is generally suitable for controlled lifting, lowering, positioning, or tensioning, while a bevel gearbox is used to transmit rotary power and change the direction of rotation, often through a 90-degree layout. The best supplier can calculate the transmission, confirm the safety requirements, and provide a practical solution rather than selling an isolated component.
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I prepared this guide for machinery manufacturers, system integrators, maintenance teams, and industrial buyers sourcing screw jacks or bevel gearboxes for new equipment. It is useful when a standard catalog model may not fully match the required load, stroke, speed, mounting arrangement, or environmental conditions. It also helps buyers evaluate whether a potential supplier has engineering and manufacturing capability instead of relying only on a product photograph or a nominal ratio.
Typical applications include lifting platforms, conveyor adjustment systems, packaging machinery, production lines, solar equipment, material-handling machines, and synchronized positioning systems. The correct choice depends on the complete operating cycle, not only on the maximum load shown in a project specification. I therefore suggest treating the gearbox, screw jack, motor, coupling, controls, and mounting structure as one integrated mechanical system.
A screw jack converts rotary input into linear lifting or positioning movement. Depending on the design, the mechanism may use a translating screw or a rotating screw with a travelling nut. It can be configured as a single unit or connected with shafts, bevel gearboxes, couplings, and multiple jacks for synchronized movement.
Important screw jack parameters include lifting capacity, stroke length, screw lead, input speed, duty cycle, backlash, mounting orientation, and holding requirements. A nominal lifting capacity should not be treated as an automatic guarantee for every application. I recommend checking dynamic loads, shock loads, eccentric loads, acceleration, frequency of operation, and the required safety factor with the manufacturer.
A bevel gearbox changes the direction of rotary power and can provide speed reduction or speed increase according to its gear arrangement and ratio. It is commonly used when the motor and driven shaft must be positioned at an angle, especially where a compact 90-degree transmission layout is valuable. Some systems use a bevel gearbox to distribute motion to several screw jacks through a common drive shaft.
For a bevel gearbox, I would review the transmission ratio, input and output speed, rated torque, allowable radial and axial loads, efficiency, backlash, lubrication, mounting position, and shaft configuration. The gearbox must also tolerate the actual starting and stopping conditions of the machine. If the equipment reverses frequently or operates with impact loading, the supplier needs this information before selecting gears and bearings.
Screw jack selection usually begins with the lifting mechanism and the required mechanical layout. Common options include worm screw jacks, ball screw jacks, travelling screw designs, rotating screw designs, and systems with safety nuts or protective components. Worm screw solutions may be suitable for controlled lifting where self-locking behavior is important, but the actual holding ability depends on the design, load, lubrication, wear condition, vibration, and operating angle.
Material selection should reflect load, speed, wear, corrosion exposure, and maintenance conditions. Gear housings may be produced from cast iron, steel, or aluminum alloys depending on the required strength, weight, and application. Gear teeth, screws, nuts, shafts, and bearings also require coordinated material and heat-treatment decisions; a strong housing alone does not determine the durability of the complete transmission.
Configuration options can include single-jack or multi-jack systems, right-angle drives, hollow or solid output shafts, different mounting flanges, protective bellows, limit switches, brakes, encoders, and customized shaft extensions. These options should be specified at the quotation stage because they affect dimensions, assembly, testing, and lead time.
I start with the total moving mass, external process force, lifting direction, center of gravity, and any off-center loading. The required stroke should be stated in millimeters, and the target travel speed should be stated in millimeters per minute or another clear unit. I also ask whether the load is static, intermittent, reversing, vibrating, or exposed to impact.
A project may require a 500 mm stroke, for example, but that number alone does not identify the correct screw jack. The supplier also needs the required lifting speed, number of cycles per hour, acceleration, and whether several lifting points must remain synchronized. These details determine screw selection, thermal behavior, motor sizing, and the need for mechanical or electronic synchronization.
For a bevel gearbox, I compare the motor speed with the required output speed and calculate the transmitted torque under both normal and starting conditions. A gearbox running at 1,500 revolutions per minute may have very different requirements from one operating at 300 revolutions per minute, even if the average power appears similar. I also check whether the output shaft carries external radial or axial forces that require additional bearing capacity.
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For a multi-jack arrangement, I verify shaft length, coupling alignment, torsional deflection, support spacing, and the number of driven units. Poor alignment can increase noise, wear, and operating torque. A qualified manufacturer should be able to review the complete arrangement drawing and identify risks that are not visible from a single component datasheet.
Duty cycle is one of the most frequently overlooked selection factors. A jack that performs acceptably in occasional adjustment may not be suitable for continuous or high-frequency lifting. I recommend documenting operating time, rest time, cycles per hour, ambient temperature, and the expected service life before choosing the screw and lubrication system.
Temperature also affects lubricant viscosity, sealing, and material behavior. If the equipment operates outdoors, in a washdown area, in dusty production conditions, or in a corrosive atmosphere, I ask the supplier to specify protection, sealing, surface treatment, and maintenance requirements. When exact environmental data is unavailable, a conservative preliminary selection is safer than choosing the smallest or least expensive model.
| Selection factor | Information to provide | Why it matters |
|---|---|---|
| Load | Static, dynamic, impact, and eccentric loads | Influences screw, nut, gear, shaft, and bearing sizing |
| Motion | Stroke, speed, acceleration, and positioning accuracy | Determines screw lead, motor requirements, and control method |
| Duty cycle | Cycles per hour and operating/rest duration | Helps assess heat generation, wear, and lubrication needs |
| Environment | Temperature, dust, moisture, chemicals, and outdoor exposure | Guides sealing, materials, finishes, and maintenance planning |
| Integration | Mounting, shafts, motors, brakes, sensors, and controls | Reduces installation changes and compatibility problems |
The first mistake is selecting by lifting capacity alone. A model rated for a certain load may still be unsuitable if the load is eccentric, the speed is excessive, the duty cycle is demanding, or the machine produces repeated shock. The second mistake is ignoring the difference between theoretical self-locking and safe load holding under real vibration and wear conditions.
Another common error is choosing a bevel gearbox from the ratio only. Buyers should also compare rated torque, peak torque, shaft loads, backlash, lubrication, mounting direction, and operating temperature. I also recommend confirming whether the gearbox is intended for intermittent or continuous service.
Finally, many projects postpone integration details until after purchase. This can create problems with shaft alignment, coupling dimensions, brake installation, limit-switch position, or control-system feedback. Supplying a layout drawing and a complete operating description at the inquiry stage usually gives the manufacturer a better basis for selection.
I evaluate suppliers across four areas: engineering, manufacturing, quality control, and after-sales support. The supplier should be able to explain its selection logic, provide dimensional drawings, clarify allowable operating conditions, and identify information still missing from the specification. A manufacturer that only confirms a model number without reviewing the application may leave the buyer responsible for avoidable system risks.
For WGT, I can discuss screw jack and bevel gearbox requirements as part of a complete industrial transmission project. Our support can include preliminary model selection, configuration review, shaft and mounting coordination, and communication of technical requirements for quotation and production. Final performance depends on the confirmed design, materials, operating conditions, and inspection requirements, so I recommend approving drawings and specifications before manufacturing.
Price is affected by capacity, ratio, materials, machining complexity, customization, quantity, testing, and accessories. A standard unit may be more economical for a simple application, while a customized assembly can reduce installation work or improve system compatibility. I recommend comparing the total procurement and integration cost rather than comparing the unit price alone.
Minimum order quantity and lead time vary by model, customization level, production schedule, and component availability. Buyers should request a written quotation that identifies the model, ratio, stroke, mounting form, shaft details, accessories, packaging, inspection scope, and delivery assumptions. If the project has a fixed installation date, this should be communicated before technical approval rather than after the purchase order.
The right screw jack and bevel gearbox manufacturer is the one that matches the transmission to the real operating conditions, not simply the one offering the lowest catalog price. I recommend starting with load, stroke, speed, duty cycle, environment, mounting, synchronization, and control requirements. Then compare suppliers according to engineering support, manufacturing capability, documentation, customization, and service.
As the next step, prepare your equipment drawing and a short technical brief containing load in newtons or kilograms, stroke in millimeters, speed, cycles per hour, motor details, installation orientation, and environmental conditions. Send this information to WGT for a preliminary review and quotation. With these inputs, we can help determine whether a standard screw jack, bevel gearbox, or coordinated lifting system is the most suitable solution for your machinery project.
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