Products > Internal Spur Gears

Internal Spur Gears

Internal Spur Gear produced by Arrow Gear
Internal spur gear

An Internal Spur Gear, similar to an external spur gear, has a cylindrical pitch surface with teeth that are parallel to the axis. However, with an Internal Spur Gear, the teeth are formed on the inner surface of a cylinder. The mating part for an Internal Spur Gear will be an external spur gear.

The teeth of Internal Spur Gears are machined by the shaping process.  For gears used in high precision applications, the teeth are ground in one of Arrow’s parallel axis tooth grinding machines.

Illustration of Internal Spur Gear
Illustration of Internal Spur Gear with mating external spur gear

Arrow’s size range and capabilities for Internal Spur Gears are provided in the list below.

Maximum Pitch Diameter – 32”
Diametral Pitch – 3.6 – 48
Face Width – 8.0
Unground Tooth – AGMA Q9
Ground Tooth – AGMA Q13