Internal Gears & Splines

Geartronics has produced a wide-range of internal gears and splines for use throughout industry for nearly 90 years. Internal gears and splines have teeth on the inside diameter of a hollow cylinder. The teeth of internal gears are of involute form; however, the profile is concave rather than convex as is the case with the involute profile of external gear teeth. Internal gears must mate with one or more external gears and their primary application is as a component of an epicyclic (planetary) gear arrangement. Internal gear teeth may be of the spur or helical form and the mating gear must be of the same type and have the axis of rotation situated parallel to that of the internal gear.

Internal splines are generated using the same processes as internal gears and usually mate with shafts having external splines to transmit power and rotation in a single axis. The teeth of internal splines may be of various forms including involute, parallel and serrated.

Internal Gear & Spline Experience

Geartronics produces thousands of internal gears and splines annually made from plain carbon and alloy steel, stainless steel, aluminum, brass, and plastics primarily for use in planetary gear sets.

We have manufactured internal gears and splines for customers from a number of industries, including:

  • Aerospace
  • Appliance
  • Automotive
  • Consumer Product
  • Defense
  • Food Processing
  • Hand & Power Tools
  • Industrial Equipment
  • Machine Controls
  • Medical Device & Equipment
  • Motion Control
  • Oil & Gas

Internal Gear & Spline Materials

Geartronics has the capability of producing internal gears and splines from a wide range of materials, including:

Castings & Forgings
Ductile Iron
Low Carbon Alloy Steel
Low Carbon Steel
Medium Carbon Alloy Steel
Preheat Treated Steel
Stainless Steels
Tool Steel

contact us

Geartronics Incorporated
100 Chelmsford Road
North Billerica, MA 01862

Call Us: 978.663.6566

Fax: 978.667.3130