Diamond Flute Router Bits

Solid carbide diamond-flute PCB router bits, also called diamond-cut router bits, are designed for routing FR-4, G10, fiberglass, phenolic laminates, PCB material, and other abrasive composites. Their fine multi-edge flute pattern helps reduce chipping and delamination when cutting board outlines, slots, cutouts, and detailed profiles.

Diamond-Flute Routers Explained — Materials, Tip Styles, and When to Use Them →

Chip Breaker vs. Diamond Flute Routers — When to Use Each →

Diamond-Cut PCB Router Bits for Abrasive Materials

Diamond-flute routers use a fine, multi-edge cutting pattern that is gentler on brittle and fracture-prone materials than more aggressive router geometries. They are commonly used for PCB routing, fiberglass laminate routing, composite work, and other applications where clean edges and controlled cutting are important.

  • Best for: FR-4 PCB material, G10, fiberglass, phenolic laminates, abrasive composites, and similar brittle materials
  • Why choose it: Helps minimize chipping, delamination, and material fracture while maintaining edge durability
  • Common uses: PCB board outlines, slots, cutouts, laminate trimming, and composite routing
  • Tip options:
    • Fish Tail tips are often preferred for delicate entry into brittle materials
    • Drill Point tips are commonly used where repeated plunging or added tip strength is required

Use the filters below to narrow the results by diameter, flute geometry, plunge-tip style, cutting direction, and Length of Cut / LOC to find the router bit needed for your application.

Choosing Length of Cut / LOC: LOC is the usable cutting length of the router bit. Use the Length of Cut / LOC filter to narrow tools by required cutting depth.

  • Through-cutting sheet material: choose an LOC longer than the material thickness.
  • Grooves, slots, pockets, or partial-depth cuts: choose an LOC deep enough for the required cut depth.
  • Small diameters: long cutting lengths are more fragile and may not be practical for deep, narrow cuts, especially in abrasive materials such as fiberglass, G10, FR-4, and carbon fiber.

Routing carbon fiber? Because carbon fiber is extremely abrasive, learn when a diamond-coated router is the better choice for longer tool life and reduced edge wear.

PCD upgrade: For carbon fiber and the most abrasive composites, explore our PCD diamond-coated router lineup →

Looking for value-priced tooling? Browse our Value Tool Deals collection for lightly used routers, factory-resharpened tools, and surplus carbide tooling offered at reduced prices.