This machine tool attachment mills full-depth keyways in through and blind bores without relief or open-end bores in one pass.

For use in:

  • Pumps
  • Aircraft Landing Gear
  • Impellers and Fans
  • Musical Instruments
  • Pharmaceutical Mixers
  • Elevators
  • Food Augers
  • Stub Shaft/Hubs
  • Electrical Motors
  • Harvesters and Farm Equipment
  • Material Handeling Sysyems
  • Pulley and Rollers

We also partner with job shops and other machining firms to solve their difficult keyway applications.

Stock Keyseat / Millers Cutters Capabilities

General Capabilities

Blind Bore
Keyseat Cutter
Special Cutting Tool
Keyseaters

Keyways
Full Depth Keyways
Custom Designs

Keyway Types

Full Depth
Internal
V-Shaped
Two-Step

Parallel (Opposite)
Radius
Splines

Components

Cutters
Driving Pins
Body

Bores

Blind
Open End

Slots

Closed-End Oil
Radius Corners
Full Radius

Splines

Straight
Radius Arc

Machining Processes

Milling
Drilling
Boring

Counterboring
Grinding

Body Materials

Cast Iron
Mild Steel
Proprietary Materials

Cutter Materials

M2
M42
T15

M48
M4

Bore Diameter

.439 to 6 in

Keyslot (Cutter) Width

.030 to 2.5 in

Keyslot Length

Up to 12 in

Number of Pins

2 to 4

Tolerance

± 0.0005 in

Testing

Test Run

Additional Services

Coating
Plating
Special Packaging

Production Volume

Prototype to Production

Typical Lead Time

Replacement Cutters within 1 Day
Keyseaters Quoted on Job by Job Basis

Additional Information

Industry Focus

Pump Manufacturers
Food Processing
Automotive
Aerospace

Power Transmission
Lumber
Musical Instruments
Industrial Fans

Intended Applications

Gears
Impellers
Stub Shafts
Couplings
Pump Sleeves
Pulleys
Valves
Impellers
Fans

Blowers
Mixers
Extruders
Propellers
Adapters
Clutches
Conveyor Belt Rollers
Motor Shafts
Landing Gear

File Formats

PDF
Images

At National Machine Tool Company we specialize in providing high quality custom keyseat millers for customers with demanding applications. Standard as well as special cutting tools and custom designs are available for production of full depth, internal, v shaped, two-step, parallel/opposite keyseats, straight splines, and radius arc splines. Our keyseat millers are the cost effective and faster alternative to EDM and broaching processes, and can work in both open end and blind bores. We offer millers in a range of sizes to produce bore diameters from .439” to 6”, keyslot widths of .030” to 2.5”, and a keyslot length of up to 12” in most material types. We manufacture attachments for use with manual equipment as well as horizontal and vertical CNC machining centers. Relief holes are not needed for the operation of our tools. For over 100 years, we at National Machine Tool have provided custom cutting solutions to meet the slotting requirements of customers in industries including food processing, pump manufacturing, automotive, aerospace, power transmission, lumber, and musical instruments. Our milling equipment has been reliably used for a myriad of applications including gears, impellers, couplings, blowers, motor shafts, pump sleeves, and valves among many others. For more details about the design and manufacturing of custom keyseat millers, or for the solutions to your internal keyseating problems please see the table below or contact us directly.

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