Hard Plastic Router Bits

Hard plastics — acrylic, Plexiglass, polycarbonate, PVC, HDPE, ABS, and polystyrene — cut differently than wood or aluminum. Run the wrong geometry and you get melted edges, chip welding, or stress cracks instead of a clean cut. This collection is solid carbide bits geared specifically for that material, with flute geometry designed to clear chips fast enough to keep heat from building up at the cutting edge.


These get used most in sign making, display fabrication, and general plastic processing — milling, engraving, and shaping work where the finished edge quality is part of the spec, not just a nice-to-have.


If you're cutting a hard plastic that's not listed here, let us know the material and thickness and we can point you to the right bit.

LMT Onsrud 63-750|1/4" O-Flute Upcut Spiral Bit for Soft Plastics - Single Flute, Solid Carbide - CNC Router Store

LMT Onsrud 63-750|1/4" O-Flute Upcut Spiral Bit for Soft Plastics - Single Flute, Solid Carbide

$58.86

SKU: 63-751* LMT Onsrud

Boost your CNC performance in plastic machining with the LMT Onsrud 63-750 – a 1/4” Solid Carbide O-Flute Upcut Spiral Bit, engineered for clean, melt-free cuts in soft plastics such as HDPE, LDPE, ABS, and acrylic.

With its single-flute upcut design and high-polish finish, this tool ensures fast chip evacuation, smooth edge quality, and reduced heat buildup—critical for plastic fabrication. Ideal for signmakers, plastic shops, and CNC users working with soft polymers.

Why it works:

  • The polished O-Flute geometry is designed to shear plastic cleanly and evacuate soft chips quickly to prevent melting or edge chatter
  • Best for;  Plastic signs and lettering, Vacuum-formed parts, enclosures and plastic components, HDPE, LDPE, ABS, Acrylic, Polycarbonate

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