A studio product shot of the Freud 77-604 three-flute mortise compression spiral router bit, featuring a solid carbide body with a polished silver shank and a dark blue-black coated spiral cutting tip.
A technical diagram of a wood profile created by the Freud 77-604 bit, illustrating a 3/8-inch cutting width, a 1-inch deep mortise, a 3-inch overall bit length, and a 3/8-inch shank.
An informational graphic titled Materials, displaying 3D samples of veneered plywood, hardwoods, softwoods, composites, and melamine or laminate to indicate the compatible surfaces for this compression router bit.
An informational graphic titled Tools, showing a handheld router, a table-mounted router, and a CNC machine spindle to demonstrate the different equipment compatible with this mortise bit.
Freud Black Ice CNC Bits promotional how to video
A studio product shot of the Freud 77-604 three-flute mortise compression spiral router bit, featuring a solid carbide body with a polished silver shank and a dark blue-black coated spiral cutting tip.
A technical diagram of a wood profile created by the Freud 77-604 bit, illustrating a 3/8-inch cutting width, a 1-inch deep mortise, a 3-inch overall bit length, and a 3/8-inch shank.
An informational graphic titled Materials, displaying 3D samples of veneered plywood, hardwoods, softwoods, composites, and melamine or laminate to indicate the compatible surfaces for this compression router bit.
An informational graphic titled Tools, showing a handheld router, a table-mounted router, and a CNC machine spindle to demonstrate the different equipment compatible with this mortise bit.
Freud Black Ice CNC Bits promotional how to video
Freud

Freud 77-604 3/8 Inch Three Flute Mortise Compression Spiral Router Bit with 3/8 Inch Shank Solid Carbide Black I.C.E. Coating Melamine and Plywood

Only 1 left
SKU: 77-604
$79.99

Description

Achieve Flawless Chip-Free Finishes on Double-Sided Materials with Precision Mortise Compression Technology

The Freud 77-604 3/8" Mortise Compression Spiral Bit is a high-performance solution engineered for woodworkers who demand perfection when routing delicate, double-sided materials. Unlike standard compression bits, this mortise-specific design features a shorter up-shear length, making it the premier choice for milling grooves, mortises, and through-cuts in thin materials 5/8" thick or less. By combining up-cut and down-cut action, this bit compresses the fibers of the material toward the center, ensuring a splinter-free finish on both the top and bottom surfaces of melamine, veneered plywood, and laminates.

Built for industrial durability, the 77-604 is manufactured from Freud Premier Solid Carbide and enhanced with TiCo™ High-Density Carbide to provide 2X the cutting life and performance of standard uncoated bits. The bit is finished with Freud’s proprietary Black I.C.E. (Industrial Cooling Element) coating, which maintains a cool cutting edge and facilitates superior chip evacuation to prevent burning and resin buildup. Optimized for high-speed use in CNC machines, handheld routers, and table-mounted setups, this three-flute bit provides a faster feed rate and a smoother finish in hardwoods, softwoods, and composites.

Key Features

  • Precision Mortising: Short up-shear length is specifically designed for perfect grooves and mortises in delicate materials.
  • Multi-Material Excellence: Expertly routs melamine, veneer plywood, hardwood, softwood, and wood composites.
  • Black I.C.E. Coating: Innovative coating keeps the cutting edge cool and ensures superior chip evacuation for a cleaner finish.
  • TiCo™ High-Density Carbide: Specialized Freud carbide provides 2X increased life and performance versus standard bits.
  • Three-Flute Geometry: Features three cutters for faster feed rates and an exceptionally high-quality finish compared to standard bits.
  • Versatile Application: Ideal for through-cuts in thin double-sided materials and professional-grade mortising tasks.

What's Included

  • (1) Freud 77-604 3/8" Three Flute Mortise Compression Spiral Bit

Specifications

Brand Freud
Model Number 77-604
Overall Diameter (D) 0.375 in (3/8")
Shank Diameter (A) 0.375 in (3/8")
Carbide Height (h) 1 in
Upcut Length 0.203 in (13/64")
Overall Length (H) 3 in
Number of Cutters 3
Maximum RPM 24,000
Material Construction Premier Solid Carbide
Coating Type Black I.C.E.

Pro-Tip: To ensure a clean finish on both the top and bottom of your workpiece, make sure your initial pass is deep enough to allow the down-shear portion of the compression bit to fully engage the top surface of the material. A pass deeper than the 13/64" upcut length is required to engage the "compression" action that prevents surface chipping on melamine and veneers.