51521 Solid Carbide CNC Spiral for Glass Reinforced Plastic Cutting 1/8 Dia x 1/2 x 1/4 Shank Up-Cut ZrN Coated Router Bit


Usually ships on the 2nd business day from order date.
Direction Up-Cut
Diameter (D) 1/8
(B) Cutting Height 1/2
Shank (d) 1/4
Overall Length (L) 2-1/2
Flutes 3
You will receive a courtesy discount of 5% if your cart exceeds $100 :)


Fiberglass-impregnated materials are well known for their abrasiveness along with a tendency to fray or shred during machining along with heat created by the router bit.

Amana Tool’s response to these challenges is an extremely free-cutting, multi-edge Glass Reinforced Plastic (GRP) multi-flute tool that shears the material without shredding or imparting unnecessary heat.

Excellent for cutting:

  • Acrylonitrile-Butadiene-Styrene (ABS)
  • Carbon Fiber Reinforced Polymer (CFRP)
  • Composite Materials
  • Coroplast®
  • Fiberglass
  • Fiberglass PCB Board
  • Fiber Reinforced Plastic (FRP)
  • High Impact Polystyrene (HIPS)
  • Low Density Polyethylene (LDPE)
  • Poly (methyl methacrylate) (PMMA)
  • Polycarbonate (Lexan™)†
  • Polyethylene Terephthalate Glycol-Modified (PETG / PET-G)
  • Thermoplastic Polyolefin (TPO)

Recommendation: Use the slowest suggested feed rates and the shortest bits necessary for cutting and routing Lexan™.

Benefits of ZrN Coating

  • Creates a harder and tougher cutting edge allows for a prolonged cutting edge life and helps to prevent the build-up of material in the flutes while cutting
  • High resistance to wear
  • Extended tool life
  • Less friction & heat buildup
  • High resistance to wear


Direction Up-Cut
Diameter (D) 1/8
(B) Cutting Height 1/2
Shank (d) 1/8
Overall Length (L) 2-1/2
Flutes 3