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Industrial Gearboxes & Gear Reducers — Specifications Database
Search helical, worm, planetary, bevel-helical, and cycloidal gearboxes from SEW-Eurodrive, Nord Drivesystems, Flender, Sumitomo, Dodge, and Rexnord. Filter by gearing style, ratio, output torque, mounting, and orientation.
Key Specification Fields
Gearing Style
Helical (high efficiency), Worm (high ratio), Planetary (compact/high torque), Bevel-Helical, Cycloidal
Gear Ratio
Output speed = Input speed ÷ Ratio. Common ranges: 5:1 to 1000:1
Output Torque (Nm or in-lb)
Maximum continuous output torque — must exceed load torque × service factor
Orientation
Inline (parallel shafts) or Right Angle (perpendicular shafts)
Mounting Style
Foot mount, shaft mount (hollow bore), flange mount, or C-face mount
Input Power (HP/kW)
Maximum motor input power
Series / Frame Size
Manufacturer-specific frame designation (e.g., SEW R37, Nord SK180)
Common Applications
- Conveyors and material handling
- Mixers and agitators
- Packaging machinery
- Hoists and cranes
- Augers and screw conveyors
- Cooling towers and fans
Frequently Asked Questions
What gear ratio do I need?
Gear Ratio = Motor speed (RPM) ÷ Required output speed (RPM). For example, a 1750 RPM motor driving a 50 RPM output shaft needs a 35:1 ratio. Always verify that the selected gearbox output torque rating (at that ratio) exceeds your required load torque, including the appropriate service factor for your duty cycle.
Helical vs. worm gearboxes — which should I choose?
Choose helical for efficiency and high power: 95–98% efficient, suitable for high-duty cycle, parallel-shaft applications. Choose worm for compact right-angle drives with high ratios (10:1 to 100:1) where efficiency is less critical. Worm boxes are 50–90% efficient depending on ratio and can be self-locking at high ratios.
What is a shaft-mount gearbox?
A shaft-mount (hollow-shaft) gearbox bores directly over the driven machine shaft, eliminating a separate coupling. The gearbox is secured against rotation with a torque arm fastened to the machine frame. Ideal for conveyors, mixers, and applications where compact, alignment-free installation is preferred.