Premium CNC & Router Bits for Precision Cutting

3/8″ O-Flute Spiral Bit – 3/8″ Shank (AstraHP Coated)

Engineered for precision and performance, our 3/8″ O Flute Spiral Bit delivers exceptionally clean cuts in plastics, acrylics, and non-ferrous materials. Crafted in the USA from premium carbide and finished with our exclusive AstraHP coating, this bit runs cooler, lasts longer, and resists edge buildup even under demanding production conditions. AstraHP Coated Solid Carbide Single Flute Up-cut Shank: 3/8″ Cut diameter: 3/8″ Length of cut: 5/8″ Recommended RPM for Acrylic – 12,000RPM 3” overall length Made in USA #row-878502883 > .col > .col-inner { padding: 20px 0px 20px 0px; } #section_1534750957 { padding-top: 45px; padding-bottom: 45px; } @media (min-width:550px) { #section_1534750957 { padding-top: 65px; padding-bottom: 65px; } } @media (min-width:850px) { #section_1534750957 { padding-top: 2px; padding-bottom: 2px; } }

3/8″ O-Flute Spiral Bit – 3/8″ Shank (AstraHP Coated) - Main image
$56.87 $78.99 In stock

Category: O Flute Spirals

Excellent for Cutting:

  • Plastic/Acrylic
  • LED Back-lit and Side-lit displays and control panels
  • Sign Foam
  • Corian
  • Fiberglass
  • Corrugated Plastics such as Correx Boards and Polypropylene
  • Dibond
  • Plexiglas
  • Hard/Soft wood
  • Wood cabinetry and sign making

What is a single flute (O Flute) bit? 

Our ‘O’ flute bits are manufactured from solid carbide tool material in straight and spiral configuration. The upcut, or right hand spiral is most readily utilized because of the need to evacuate chip in an upward direction in flat sheet or block applications. Upward movement of chips avoids welding, which is a common problem in the machining of plastic. With a high rake angle and relatively low helix, O-flute cutters manage to cut acrylic, polycarbonate, ABS, PVC at very high chip loads without raising a burr or fracturing the edges of the surface. All of this while leaving a really clean surface finish. O flutes also work incredibly well in wood and aluminum with effortless chip removal.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 5 reviews)

Zoe B. ★★★★★

The AstraHP coating really makes a difference on acrylic — I was cutting 1/4-inch panels for a sign job and got zero melting or chipping along the edges. Feeds smoothly through the material without grabbing or chattering.

Samuel ★★★★★

The cut on this 3/8″ spiral bit through polypropylene sheets was incredibly clean, with no chipping at the edges. I was especially impressed with how easily it handled the fiberglass test piece without leaving any fuzz.

Eli F. ★★★★★

I was worried about melting the acrylic on my LED sign panels, but this bit carved through them clean with zero chipping. The AstraHP coating kept the edge sharp the whole job, even on the corrugated polypropylene scraps.