A professional studio shot of the Freud 77-405 solid carbide mortise compression spiral router bit, showing the specialized 3/8 inch shank and the unique two-flute cutting geometry designed for chip-free mortising in double-sided materials.
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 bit.
A professional studio shot of the Freud 77-405 solid carbide mortise compression spiral router bit, showing the specialized 3/8 inch shank and the unique two-flute cutting geometry designed for chip-free mortising in double-sided materials.
A professional studio shot of the Freud 77-405 solid carbide mortise compression spiral router bit, showing the specialized 3/8 inch shank and the unique two-flute cutting geometry designed for chip-free mortising in double-sided materials.
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 bit.
A professional studio shot of the Freud 77-405 solid carbide mortise compression spiral router bit, showing the specialized 3/8 inch shank and the unique two-flute cutting geometry designed for chip-free mortising in double-sided materials.
Freud

Freud CNC Router Bit 77-405 3/8 Inch Cutting Diameter (Solid Carbide Shorter Up Shear Two Flute Mortise Compression Spiral Plywood Melamine Tool)

Only 1 left
SKU: 77-405
$69.79 USD

Description

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Professional Solid Carbide Shorter Up-Shear Mortise Compression Spiral CNC Routing Bit

The Freud 77-405 is an industrial-grade 3/8-inch cutting diameter solid carbide mortise compression spiral router bit featuring a 3/8-inch shank and a 1-1/4 inch carbide height, engineered to execute chip-free groove milling, deep mortising, and perimeter profile cutting on thin double-sided sheet stock. Forged from proprietary TiCo high-density carbide and treated with a heat-resistant Black I.C.E. industrial cooling element coating, this specialized two-flute tool incorporates a shortened up-shear section that forces top and bottom fibers inward toward the material center. Operating up to an architectural maximum threshold of 24,000 RPM on multi-axis CNC machinery, table routers, and handheld units, the balanced compression geometry delivers mirror-smooth face edges on laminated plywood, melamine panels, and wood composites 5/8-inch thick or less.

Best Used For:

  • Melamine Panel Dado Routing: Slicing flawless, chip-free dado grooves and blind mortises into plastic-laminated particle boards without face veneer blowing.
  • Thin Double-Sided Sheet Sizing: Executing clean single-pass profile cuts through veneer plywood sheets 5/8-inch thick or less with zero underside or topside splintering.
  • High-Speed Production Joinery: Milling precision mortise pockets and structural pocket joints inside dense furniture hardwoods or cabinet core composites.

Key Performance & Safety Features

  • Shortened Up-Shear Geometry: Reduced length helix design accommodates shallow pocket channels while ensuring downward compression forces are maintained on top veneers.
  • Dual-Action Compression Design: Opposing helical flutes pull board edges toward the middle profile plane to neutralize tearing on double-faced workpieces.
  • Black I.C.E. Composite Coating: Advanced organometallic layer shields cutting wings from friction heat and pitch accumulation to double tool lifespan metrics.
  • TiCo High-Density Solid Carbide: Sub-micron carbide core configuration provides exceptional core hardness to uphold sharp edge retention under high abrasion.
  • Concentric Two-Flute Layout: Dual-cutter configuration balances machine spindle loads to limit dynamic vibration harmonics over intensive production runs.

What's Included

  • (1) Freud 77-405 3/8" Two Flute Mortise Compression Bit

Technical Specifications

Brand Name: Freud Tools
Model Number: 77-405
Tool Accessory Classification: CNC Router Bit Accessory
Cutting Diameter (D): 3/8 in.
Carbide Cutting Height (h): 1-1/4 in.
Shank Diameter Sizing (A): 3/8 in.
Overall Length Dimension (H): 3 in.
Total Number of Cutters: 2 Flutes
Maximum Angular Velocity: 24,000 RPM
Material Metallurgy Core: TiCo Super-Density Solid Carbide
Surface Core Treatment: Black I.C.E. (Industrial Cooling Element) Coating
Flute Configuration Style: Mortise Compression Spiral Pattern
Optimal Thickness Threshold: 5/8 in. or Thinner Double-Sided Stock

Pro-Tip: When initiating a profile cut plunge pass with this mortise compression bit, ensure the initial entry depth configuration exceeds the short up-shear tip length metric in a single dynamic stroke. Getting the down-shear flutes into engagement below the top sheet face quickly establishes dual compression, completely shielding vulnerable top edge veneers from lifting.