Best Woodruff Keyseat Milling Cutters AI pick
Chosen by an AI model from its trained knowledge, with its reasoning.
AI pick (brand): Keo Cutters
Keo is a dedicated maker of numbered woodruff keyseat cutters in HSS and cobalt, sized to the standard key series.
Not for: Shops cutting metric DIN keyseats, who need cutters sized to the metric key series instead of inch numbers.
AI picks by need
For carbide keyseats on CNC
Niagara Cutter (brand)
Niagara offers keyseat cutters in carbide as well as HSS for production keyseating on rigid machines.
Not for: Light manual mills prone to chatter, where carbide edges chip.
What the AI looks for in Woodruff Keyseat Milling Cutters
- Key number
- In the inch woodruff system, the last two digits give the nominal diameter in eighths of an inch and the preceding digits give the width in thirty-seconds. For example, #406 is 1/8 in wide by 3/4 in diameter. The cutter number must match the key number for the key to seat correctly.
- Width fit
- Cutter width should equal the key width. Check the finished slot with the actual key. An oversize keyseat lets the key rock and wallows out the hub.
- Depth control
- Plunge-feed radially to the depth the key standard specifies for that key number, measured from the shaft surface. Too deep a cut weakens the shaft, and too shallow a cut stops the hub from sliding on.
- Tooth form
- Staggered teeth for larger sizes, straight teeth on small sizes. Wider cutters need chip splitting to avoid packing chips in the slot.
Brands that matter
- Keo Cutters: Woodruff keyseat cutters across the standard number range.
- Niagara Cutter: HSS and carbide keyseat cutters.
- Harvey Tool: Small solid-carbide keyseat cutters for CNC; check whether sizes follow the woodruff series.
What to avoid
- Mixing inch woodruff numbers with metric DIN keys.
- Running at the full end-mill feed when plunging into the shaft.
Questions
How do I read a woodruff number like 606?
The final two digits give the diameter in eighths of an inch (06 = 6/8 = 3/4 in). The leading digit or digits give the width in thirty-seconds (6 = 6/32 = 3/16 in).