National Machine Tool Company
Providing Keyway Solutions Since 1903
National Machine Tool Company | National Machine Tool Company Providing Keyway Solutions Since 1903

Keyway Milling of a Coupling/Adapter for an Electric Motor Manufacturer

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Custom Keyseat Miller
Custom Keyseat Miller

A customer in the electric motor manufacturing industry had an application with a metric bore requiring a keyway. With our years of experience in the keyseating field at National Machine Tool Company, we provided an ideal solution to their keyway need. Utilizing our engineering team and customer provided drawings for product design and development, a special keyseat miller was designed. With a reduced length pilot, our tool milled a full depth slot to specifications. We utilized an M42 cutter coated AlTin for better wear resistance in this application. We applied our CNC milling and turning in addition to grinding processes to manufacture the coupling/adapter keyseat miller. The coupling/adapter was composed of 316 stainless steel and manufactured within a tolerance of ±.0002". Final keyway dimensions were .25" in width, 1.375" long and .375" from the bottom of the bore with no relief hole. At NMT, we provide stock items with a turnaround of 2-3 days and custom items within 2-3 weeks to locations worldwide.

For more information on this project, or the processes involved, see the table below, or contact us directly.

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Keyway Milling of a Coupling/Adapter Project Highlights

Product Name
Coupling/Adapter Keyseat Miller
Problem Description
Metric Bore needs a keyway .250" wide, 1-3/8" long and 3/8" from the bottom of the Bore-no relief hole
Special Keyseat Miller with reduced length pilot mills full depth slot utilizing M42 cutter coated AlTin for better wear resistance
Capabilities Applied/Processes
  • Product Development/Design
CNC Milling
CNC Turning
Keyway Dimensions
0.25" Wide
1.375" Long
0.375" from the bottom of bore-no relief hole
Tightest Tolerances
Within 0.0002"
Material Cut
316 Stainless Steel
In process testing/inspection performed
Dimensional Inspection, Visual Inspection, Functionality
Industry for Use
Electric Motor Manufacturing
Delivery/Turnaround Time
Stock Items: 2 - 3 Days
Custom Items: 2 - 3 Weeks
Delivery Location
Nationwide/ Worldwide
Standards Met
Customer Specifications, 2D CAD Drawing

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