CNC router bits and carbide cutting tools with tutorials and technical guides

3-flute Carbide Fret Cutters - 1/8 in. (0.125 in. shank) (MM3I8) - (0.125 in. shank)

UltraBIT 3-flute 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.

When cutting fret slots in rosewood, ebony or african blackwood fingerboards (Janka value greater than 2,700 lbf) or any wood with a high silica content, it is better to use a relieved-neck shell cutter because of their superior stiffness and resistance to breakage.

Shell cutters (MS3I8 family) compatible with the most popular fret wire sizes are included in the list below.

MADE IN USA

  • 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.
  • Fish tail point eliminates backside breakout and splintering
  • High flute volume supports high feed rates / chip loads
  • 3-Flute design eliminates chatter at high feed rates
  • 3-Flute design brings the rigidity and precision of a stub mill to a high-aspect ratio cutter.
  • Cutting edge geometry tuned for cross-grain ebony machining
  • Cutting fret slots in rosewood and ebony finger boards
  • Clean-up cutting of inlay pockets and components
Carbide 3-flute end mills for curring frets hardwood and softwood fingerboards

Diameter LOC Reach Flutes Coating Shank OAL Depth Rings Reviews Part Number Price
0.0200" (0.51mm) 0.18" (4.57mm) 3 1/8" 1.50" (38.1mm) Available MM308-0200-018F

$22.96

0.0200" (0.51mm) 0.09" (2.29mm) 3 1/8" 1.50" (38.1mm) Available MM3I8-0200-009F

$19.84

0.0220" (0.56mm) 0.09" (2.29mm) 3 1/8" 1.50" (38.1mm) Available MM3I8-0220-009F

$19.84

0.0220" (0.56mm) 0.09" (2.29mm) 3 ZrN 1/8" 1.50" (38.1mm) Available MM3I8-0220-009FC

$23.69

0.0220" (0.56mm) 0.09" (2.29mm) 0.26" (6.6mm) 3 1/8" 1.50" (38.1mm) Available MM3I8-0220-026FN

$25.70

0.0230" (0.58mm) 0.09" (2.29mm) 3 1/8" 1.50" (38.1mm) Available MM3I8-0230-009F

$19.84

0.0230" (0.58mm) 0.09" (2.29mm) 3 ZrN 1/8" 1.50" (38.1mm) Available MM3I8-0230-009FC

$23.69

0.0230" (0.58mm) 0.09" (2.29mm) 0.26" (6.6mm) 3 1/8" 1.50" (38.1mm) Available MM3I8-0230-026FN

$25.70

0.0250" (0.64mm) 0.10" (2.54mm) 3 1/8" 1.50" (38.1mm) Available MM3I8-0250-010F

$19.84

0.0200" (0.51mm) 0.04" (1.02mm) 0.08" (2.0mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0200-008F

$21.45

0.0200" (0.51mm) 0.04" (1.02mm) 0.08" (2.0mm) 3 ZrN 1/8" 1.50" (38.1mm) Available MS3I8-0200-008FC

$24.95

0.0200" (0.51mm) 0.04" (1.02mm) 0.13" (3.2mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0200-013F

$26.28

0.0200" (0.51mm) 0.04" (1.02mm) 0.16" (4.1mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0200-016F

$27.44

0.0210" (0.53mm) 0.04" (1.02mm) 0.08" (2.0mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0210-008F

$21.45

0.0220" (0.56mm) 0.06" (1.52mm) 0.13" (3.2mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0220-013F

$25.13

0.0230" (0.58mm) 0.06" (1.52mm) 0.13" (3.2mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0230-013F

$25.13

0.0230" (0.58mm) 0.06" (1.52mm) 0.13" (3.2mm) 3 ZrN 1/8" 1.50" (38.1mm) Available MS3I8-0230-013FC

$32.15

0.0240" (0.61mm) 0.06" (1.52mm) 0.13" (3.2mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0240-013F

$25.13

0.0250" (0.64mm) 0.05" (1.27mm) 0.10" (2.5mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0250-010F

$23.81

0.0250" (0.64mm) 0.05" (1.27mm) 0.13" (3.2mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0250-013F

$25.13

0.0260" (0.66mm) 0.06" (1.52mm) 0.13" (3.2mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0260-013F

$25.13

0.0270" (0.69mm) 0.06" (1.52mm) 0.13" (3.2mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0270-013F

$25.13

0.0280" (0.71mm) 0.06" (1.42mm) 0.13" (3.2mm) 3 1/8" 1.50" (38.1mm) Available MS3I8-0280-013F

$23.44