Racks are portions of a cylindrical disk with an infinite radius which has involute shaped tooth cut into its face. Racks mate solely with spur gears that have the same module, pressure position and preferably face width. KHK offers gear racks in many materials, configurations, modules and lengths. One unique feature of our racks is that most are supplied with finished ends. This kind of production permits multiple racks to become butted, end-to-end, to produce one continuous amount of rack. Most of the products that we offer allow for secondary functions such as reduction of the length, the adding of tapped holes, or the application of heat treatment. Our offering also contains products that have already had some of these secondary operations completed.
The straight tooth cylindrical gear for which the radius of the pitch cylinder is infinite and in a bar form is called a gear rack. If it is sorted by the positions of the apparatus shafts, it belongs to the parallel shaft category. The spur equipment that meshes with a equipment rack is normally called a Metric Gear Rack pinion.

Besides equipment racks with straight range teeth, there are helical racks which have slanted tooth. Helical gear racks are paired with helical gears, but because of the slant of the tooth direction, as in helical gears, the mesh generates axial thrust forces.

Among the gear racks’ primary applications are machine tools and transport devices and when the applications involve transmitting linear motions, they are often weighed against ball screws. In those cases, the main advantages of gear racks can be named such as being able to meet a heavier load through the use of larger modules and having no duration limitation by connecting equipment racks with completed ends. On the other hand, a good example of the disadvantages of equipment racks includes the occurrence of backlash.

When manufacturing gear racks, due to their bar form, bending often results. In these cases, corrective procedures using presses are often employed.