0.1220" (3.10mm) × .400" LOC Diamond Flute PCB Router, Fish Tail, 1/8" Shank | R181

Kyocera 3.10mm Diamond-Flute PCB Router | .400" LOC | Fish Tail | Up-Cut

The R181 Kyocera solid carbide diamond-flute router features a 0.1220" (3.10mm) cutting diameter, 0.400" (10.16mm) length of cut, 1.500" overall length, and 1/8" (3.175mm) shank. Designed for precision CNC routing, this tool is suitable for FR4/G10 fiberglass laminates, printed circuit boards, phenolic materials, and other abrasive composites.

Its diamond-pattern cutting geometry uses numerous small, intersecting cutting edges for controlled material removal. The fishtail tip provides end-cutting capability, while the up-cut configuration helps direct routing debris upward during cutting.

Key Features

• 0.1220" (3.10mm) cutting diameter: Precision cutting width for PCB outlines, slots, contours, and composite routing
• 0.400" LOC: Provides 10.16mm of cutting reach for suitable fiberglass laminates and composite panels
• Diamond-flute geometry: Multiple intersecting cutting edges help control fiber pull-out, fraying, and chipping under suitable machining conditions
• Fish tail tip: End-cutting geometry supports entry and through-routing in suitable sheet materials
• Up-cut configuration: Helps direct chips and routing debris upward during machining
• Solid tungsten carbide: Provides rigidity and resistance to abrasive wear
• 1/8" shank: Fits compatible precision CNC spindle collets and tool holders

Diamond-Flute Geometry & Fish Tail Tip

Diamond-flute routers, also known as diamond-cut or diamond-pattern routers, feature numerous small, intersecting cutting edges rather than conventional continuous spiral flutes. This geometry is commonly used for machining abrasive and layered materials such as FR4 printed circuit boards, G10 fiberglass laminates, and reinforced composites.

The fishtail tip provides cutting edges at the tool end for entry into suitable sheet materials and through-routing applications. When used with properly selected cutting conditions and secure workholding, this geometry can help limit material breakout and edge damage.

The up-cut configuration helps move routing debris toward the upper surface of the workpiece. Actual edge quality depends on material, spindle speed, feed rate, tool condition, and workholding.

0.400" Cutting Length

R181 provides 0.400" (10.16mm) of cutting length, offering additional reach for routing suitable thicker PCB laminates and composite sheets.

Choose a cutting length appropriate for the workpiece thickness and provide adequate clearance beneath the material when through-cutting. Use appropriate cutting depths and avoid excessive side loading to help limit tool deflection.

Material note: Diamond-flute describes the cutting-edge geometry. This router is uncoated solid carbide, not diamond-coated or PCD tooling.

Typical Applications

• PCB board outlines, profiling, slots, and cutouts
• FR4 and G10 fiberglass laminate routing
• Phenolic and epoxy laminate machining
• Fiberglass-reinforced composite trimming
• Carbon-fiber composites where uncoated carbide tooling is appropriate
• Precision CNC contouring and prototype fabrication

Technical Specifications

Feeds & Speeds

Spindle speed, feed rate, depth of cut, and secure workholding are important when machining abrasive PCB laminates and composite materials.

View Diamond-Flute Router Feed & Speed Chart for general starting recommendations for FR4, G10, fiberglass, and related materials.

Recommended cutting parameters are starting points only. Adjust for material, machine rigidity, spindle capability, tool condition, and cutting engagement. Use suitable dust extraction when machining fiberglass or carbon fiber.

Related Router Bits & Guides

Shop Diamond-Flute PCB Router Bits
Browse additional cutting diameters, lengths of cut, and tip configurations.

Diamond-Flute Router Guide
Learn about diamond-cut geometry, fishtail and drill-point tips, and selecting suitable routers for abrasive laminates.