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Racks are portions of a cylindrical disk with an infinite radius which includes involute shaped teeth cut into its face. Racks mate specifically with spur gears that have the same module, pressure angle and preferably face width. KHK offers gear racks in many materials, configurations, modules and lengths. One exclusive feature of our racks is that most are given finished ends. This kind of production allows for Metric Gear Rack multiple racks to be butted, end-to-end, to create one continuous amount of rack. Most of the products that people offer enable secondary functions such as for example reduction of the space, the adding of tapped holes, or the use of heat treatment. Our offering also includes products which have already had a few of these secondary operations completed.
The straight tooth cylindrical gear that the radius of the pitch cylinder is infinite and in a bar form is named a gear rack. If it’s sorted by the positions of the gear shafts, it belongs to the parallel shaft category. The spur gear that meshes with a equipment rack is generally called a pinion.

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

Among the apparatus racks’ main applications are machine tools and transport devices and when the applications involve transmitting linear motions, they are generally compared with ball screws. In those situations, the main advantages of gear racks can be named such as being able to meet a heavier load by using bigger modules and having no size limitation by connecting gear racks with finished ends. However, a good example of the disadvantages of gear racks includes the occurrence of backlash.

When manufacturing gear racks, because of their bar form, bending often results. In such cases, corrective procedures using presses are often employed.