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External Rotary Broaching

Broaching of External forms is also possible using the same concept as ID Broaching except it uses a precision cutter to shape the outside diameter of the part. This operation is ideal for parts that are identical for the entire circumference of the part. Also the part needs to have relatively loose tolerances as this operation is hard to keep tight. Creating parts such as gear teeth is not possible. Ideal parts for this application would be for example, faucet handles, automotive wiper blade axles, splines, hand grips on the OD of the part, and wrench flats. Typically tolerances can be held to within a .003-.005. Please call to discuss your application.

External spline broach tool

External Spline Die

Above is an example of a custom external form that can be manufactured for your application. External tools can be used on Adjustable 6180, 6181 & Swiss type 2100 & 2160 series holders. ALL External Broaches are made to order. Please issue a part drawing to us here at

Application Recommendations: Your Blank Part specs cannot exceed the following:

  • No More than .040" Difference in Major to Minor Diameter

  • S= min size ~.050"

  • S= max size ~ 5/8"

  • No more than 1.5xS for profile length where S = Major Diameter

  • Max profile length cannot exceed 15mm due to tooling limitations.

  • Involute profiles and gear teeth are not recommended applications of this process.

Possible External Forms: Serration | Rough Spline | Hexagon | Torx/Hexalobular

external rotary broach profiles

External Broaching Tools are Precision Manufactured to your specifications by PCM® Willen SA of Switzerland

Thank you for taking the time to visit our site. Please do not hesitate to call or email with rotary broaching application questions or if you need help deciding which tools are right for your job.

Hours of Operation: Mon - Fri    8:00AM  -  5:00PM Eastern Time

Genevieve Swiss Industries, Inc.
6 Old Stage Road
Westfield, MA 01085
Ph: (413) 562-4800
Fx: (413) 562-4802
All Images and Content ©Genevieve Swiss Ind. Inc.