SPH Series Helical Inline Gearboxes: Quality, Performance, U.S. Manufacturing

Cutaway of SPH gearbox showing internal gears

The SPH inline planetary gearbox is the highest precision solution for today's demanding motion control applications. With helical gears, the SPH is designed for dynamic and cyclic applications and can also be optimized for high speed and continuous duty applications

  • Smooth, quiet operation and high torque and accuracy with precision helical gearing
  • Superior stiffness for high torsional rigidity
  • Low backlash < 4 arcmin
  • Available in 6 frame sizes with nominal torque ratings from 15 to up to 900Nm
  • Easy integration with 4 output configurations and integrated motor mount plate
  • U.S. manufacturing for short lead times

The SPH gearbox performance and quality, along with GAM’s manufacturing flexibility and overall service, will provide you with the best solution on the market.

Reduced Lead Times from GAM

Frustrated with gearbox supplier lead times? Ask about GAM's new reduced lead times! Contact us today to discuss your application. We can cross over from your current design or suggest an alternate solution.

Contact Us!

GAM Helical Gears are wider than the competitionGAM Helical Gearing Makes the Difference

  • Greater torque density from wider gears
    • Gear face width up to 70% larger than than competitor gears
    • Greater tooth contact
  • Case hardened gears which imparts strength deeper into the gear compared to nitriding which hardens just the surface.
  • Optimized helix angle for maximum torque density

SPH Series Models


SPH-W Shaft Output Gearbox
  • Shaft output design for mounting to pulleys and rack and pinion systems
  • Ratios from 3:1 to 100:1
  • Frame sizes from 50 mm to 180 mm (larger sizes available by request)
  • Tech specs & CAD Models


SPH-K  with Housed Bellows Coupling Output
  • Bellows coupling on the output for a hollow clamping connection.
  • High performance bellows coupling on the output provides high stiffness in dynamic applications
  • Ratios from 3:1 to 100:1
  • Tech specs & CAD Models


SPH-F Flange Output Gearbox
  • Flange output design for direct mounting to pulleys and rack and pinion systems.
  • Compact design with high torsional stiffness and load capacity.
  • Ratios from 4:1 to 100:1
  • Frame sizes from 75 mm to 140 mm
  • Tech specs & CAD Models


SPH-C with Bellows Coupling Output
  • Bellows coupling output without the bell housing of the SPH-K models.
  • Plug the gearbox into your machine and achieve a more compact design
  • Ratios from 3:1 to 100:1
  • Frame sizes from 50 mm to 180 mm
  • Tech specs & CAD Models


SPH-SP with helical pinion

Additional Information

SPH Series Benefits

  • Helical Gearing
  • Lower backlashes
  • Lower noise levels
  • Smoother torque transmission