Cold Rolled Spur Gears

Featured Product from Grob, Inc.

Cold Rolled Spur Gears-Image

Cold Rolled Spur Gears: Stock & Custom
Grob’s spur gear stock allows you the flexibility to create cold rolled spur gears that meet your exact specifications. We do this by creating long bar lengths of spur gear stock which allows you to cut or machine your steel spur gear to the lengths you need.

Standard Spur Gears

  • Available in mild to medium carbon steel, as well as aluminum
  • Available in either 14.5° or 20° pressure angles
  • Diametral Pitches ranging from 6 to 48
  • Modules ranging from .6 to 4
  • Outside Diameters (O.D.) up to 6″
  • AGMA 6-8 Quality


Need a custom spur gear? Call Grob Inc. We manufacture a variety of standard cold rolled bar stock and custom cold rolled stock, either to our specifications or to yours. For custom, simply upload your drawing through our website and we’ll contact you with a solution. Whether you use Grob standard stock or custom, you are getting a trusted name in materials and workmanship for your spur gear application.

Custom Spur Gears

  • Modified major diameters
  • Modified minor diameters
  • Modified backlash
  • Modified involute profiles


Cold Rolled Products:

  • Save time & money
  • Create parts from bar stock
  • Over 1700 shapes from existing tool
  • Custom shapes tooled quickly

Cold Rolled Advantage

Strength and Surface Finish

The Grob Rolling process increases the strength by rearranging the grain structure of the material over the entire tooth profile. The greatest amount of strength is gained near the bottom, or root area of the form where strength is most crucial. The result of the cold forming process produces a very high surface finish. Roughness average, Ra Readings of 4 micro inches have been produced.

Grob Rolling Method

With Grob cold roll forming, the groove is formed down between the teeth. The material displaced from area "A" (see sketch below) forms the tooth tip area "B". This is a severe reverse flow. With no elongation, the area of raw material displaced must be the exact same as the area it was displaced from.

Through this process, we're able to roll both even and uneven numbers of teeth on a cylindrical blank with symmetrical patterns only. Tubular blanks can be formed over a grooved mandrel, which permits internal corrugation of the blank white external shape is rolled.

Material and Solid Blank Preparation

Because the Grob Rolling process displaces material instead of removing it, proper material selection is important. With this process, almost any ductile material may be used. Generally, material with a hardness of less than Rockwell "C" 20 works well. If carbon steel or alloy steel is to be used, it must be annealed first. The blank or stock must be free of flaws, uniform in ductility, and must be the correct outside diameter to produce an accurate form.

Strength Through Innovation

Work hardening of the rolled form depends on the material composition, the hardness before rolling, the depth of the tooth form, and the feed rate of rolling. Not all material works well for the same shape. For example, aluminum and some stainless steels may be formed to produce a spline shape or shallow tooth form, but may not be used to produce a full depth gear because the material work hardens too quickly and will not flow up to fill in the tooth form

Watch>>>Grob Inc. - Manufacturing Marvels

About Grob:
Grob Inc. is a unique manufacturer of metal cutting bandsaws and cold rolled products. With over six decades of industry-changing patents and innovations, the family owned and operated company offers superior performance and strength in everything they make.