Think & Tinker, Ltd.
CNC router bits and carbide cutting tools with tutorials and technical guides
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3-flute Carbide Fret Cutters (MM3I8-0250-010F) - 1/8 in. (0.125 in. shank)

UltraBIT fret cutters were designed specifically for cross-grain cutting in ebony and dry rosewood. They are used for cutting the fret slots (kerfs) in fingerboards and for executing the clean-up pass when cutting inlay pockets. The enhanced rigidity of the three flute design insures minimum point deflection (wander) under high feed rates.

  • Geometry - 3 flute, 1/8 in. shank, fish tail point
  • Length - 1.5 in. ±0.010 in.
  • Diameter - nominal ±0.0005 in.
  • Max runout (TIR) - < 0.0005 in.
  • Max. depth of cut - nominal ±0.005 in.
  • Anticipated Life - 3,000 linear inches (cross-grain ebony, CNC milling)
  • Material - solid submicrograin carbide
  • Ring Set - 0.800 in. ±0.002 in. (optional)
  • Operating RPM - CNC certified operation 20k RPM to 100k RPM
  • Feeds/speeds - to determine the optimum Feed/Speed combinations,
    run our Sweet-spot Test.
Carbide 3-flute end mills for curring frets hardwood and softwood fingerboards

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Depth setting ring
Item # Description Unit Price Depth Ring Enter Qty.
MM3I8-0200-009F  0.0200 in. (0.508 mm) Ultrabit 3-flute Fret-wire kerf cutter, 0.09 in. max DOC, 1.5 in. OAL   $19.84   
MM3I8-0220-009F  0.022 in. (0.559 mm) dia. Ultrabit 3-flute Fret-wire kerf cutter, 0.090 in. max DOC, 1.5 in. OAL   $19.84   
MM3I8-0220-009FC  0.022 in. (0.559 mm) dia. ZrN coated Ultrabit 3-flute Fret-wire kerf cutter, 0.090 in. max DOC, 1.5 in. OAL   $23.69   
MM3I8-0220-026FN  0.022 in. (0.559 mm) dia. Ultrabit 3-flute end-mill, 0.090 in. EFL, necked 0.0190 in. dia. to 0.260 in. reach, 1.5 in. OAL   $25.70   
MM3I8-0230-009F  0.0230 in. (0.584 mm) dia. Ultrabit 3-flute Fret-wire kerf cutter, 0.090 in. max DOC, 1.5 in. OAL   $19.84   
MM3I8-0230-009FC  0.0230 in. (0.584 mm) dia. ZrN coated Ultrabit 3-flute Fret-wire kerf cutter, 0.090 in. max DOC, 1.5 in. OAL   $23.69   
MM3I8-0250-010F  0.0250 in. (0.635 mm) UltraBIT 3-flute Fret-wire kerf cutter, 0.10 in. max DOC, 1.5 in. OAL   $19.84   
MM3I8-0250-013F  0.0250 in. (0.635 mm) UltraBIT 3-flute Fret-wire kerf cutter, 0.125 in. max DOC, 1.5 in. OAL   $19.84   
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