Open Gearing


Helical Gears

Boston Gear's stock helical gears are manufactured in both right- and left-handed configurations with an industry standard 45° helix angle to transmit motion and power between non-intersecting shafts that are parallel or at 90° to each other. For parallel shaft operation, helical gears with opposite-hand helix angles are required. For shafts at 90°, a same-hand helix angles must be used.

For parallel shaft applications, the overlapping tooth contact of our helical gears provides smoother, quieter operation and higher horsepower capacity than spur gears of comparable size. For 90° shaft applications, the tooth-contact area of helical gears is very small, making it ideal for applications requiring only limited load carrying capacity.

    • Helical gears can be used in a variety of applications since they can be mounted on either parallel or on 90° non-intersecting shafts. 
    • Helical gears offer additional benefits relative to spur gears: 
      • Greater tooth strength due to the helical wrap around
      • Increased contact ratio due to the axial tooth overlap
      • Higher load carrying capacity than comparable sized spur gears. 
    • Smoother operating characteristics
    • The close concentricity between the pitch diameter and outside diameter allow for smooth and quiet operation
    • 14 1/2 Normal pressure angles
    • Available 24DP - 6 DP
    • Stock Gears in Bronze & Hardened Materials
    Boston Gear
    701 Carrier Dr.
    Charlotte, NC 28216
    Web: CONTACT
We are now a part of Regal Rexnord.