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micrO-flute® Radiused Single Flute Thermoplastic Cutters (MP108) - 1/8 in. (0.125") shank

The "O" flute geometry introduced more than a decade ago is one of the most efficient flute designs for cutting thermoplastics that has yet been invented. With a high rake angle and relatively low helix, O-flute cutters manage to cut acrylic, polycarbonate, ABS, PVC and a host of other sheet polymers at very high chiploads without raising a burr or fracturing the edges of the kerf. All of this while leaving a remarkably clean surface finish. The real surprise is that this revolutionary geometry also works incredibly well in wood and aluminum.

One of the recurring complaints about O-flute tools, is that the high chipload results in "swirl marks" in the bottoms of pockets. For most applications, this is not a problem but, in the case of side-lit transparent acrylic panels, these artifacts can severely impact the quality of the engraved image. Our radiused micrO-flute tools virtually eliminate these cutting marks, yielding a smooth, near specular bottom finish.

Carbide micr-O 1-flute for softwoods and thermoplastics


  • Geometry - radiused micrO-flute®, 1-flute, up-cut, center cutting
  • Length - 1.5 in. 0.010 in.
  • Diameter - nominal"0.0005 in.
  • Flute tip radius - Diameter X 0.18
  • Shank dia. - 0.1250 in. (3.18 mm) +0.00, -0.0002 in.
  • Max. runout (TIR) - < 0.0005 in.
  • Max. depth of cut - EFL varies by diameter 0.005 in.
  • Material - solid submicrograin carbide
  • Ring Set - 0.800 in. 0.002 in. (optional)
  • Operating RPM - CNC certified operation 20k RPM to 100k RPM




  • High rake, modified "O" style flute optimized for cutting thermoplastics
  • 1-Flute design allows efficient swarf removal under high chiploads
  • Optimized cutting edge geometry designed for burr-free, fractureless profile cutting
  • Radiused flute significantly reduces cutting artifacts in blind slots and pockets


  • Medical fixtures and components
  • Dental and Othrodontic appliances
  • Integrated optical substrates
  • Micro-fluidic control assemblies
  • Interocular lens fabrication
  • Back-lit and Side-lit displays and control panels

0.0160in. micr-O ULTEM cuts
Wood / Plastic - Standard Length End-mills
1/8 in. Shank
1-flute Radiused
1/8 in. Shank
3mm Shank

If your purchase is over US$50,
you save $5 in shipping!
    Sales Items    
Item # Description Unit Price Depth Ring Enter Qty.
MP108-0625-025FR  1/16 in. (0.0625 in., 1.600 mm) micrO-Flute radiused 1-flute upcut thermoplastic cutter, 0.250 in. max DOC, 1/8 in. shank, 1.50 in. OAL   $36.95    Sale Price: $28.95   
MP108-0787-031FR  0.0787 in. (2.000 mm) micrO-Flute radiused 1-flute upcut thermoplastic cutter, 0.313 in. max DOC, 1/8 in. shank, 1.50 in. OAL   $36.95    Sale Price: $28.95   
MP108-0938-040FR  0.0938 in. (3/32in. 3.32 mm) micrO-Flute radiused 1-flute upcut thermoplastic cutter, 0.400 in. max DOC, 1/8 in. shank, 1.50 in. OAL   $36.95    Sale Price: $28.95   
MP108-1250-050FR  0.1250 in. (3.18 mm) micrO-Flute radiused 1-flute upcut thermoplastic cutter, 0.500 in. max DOC, 1/8 in. shank, 2.00 in. OAL   $34.40    Sale Price: $26.95   
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FAX:  866-453-8473
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Updated 10/7/2016 5:44:41 PM