Studio product shot of the Freud 12-186 double flute straight router bit, featuring a thick 1/2-inch silver shank and a wide red Perma-SHIELD coated cutter head with large carbide flutes.
Technical diagram showing a cross-section of a wood cut, indicating a wide slot width of 1-3/8 inch and a cutting depth of 1-1/4 inch for model number 12-186.
3D computer graphic showing a block of wood with a wide, deep square channel groove cut into the top surface, illustrating the heavy material removal profile of the bit.
Top-down diagram of the router bit profile showing the large circular cutting path and the arrangement of the two grey carbide cutting flutes against a red background.
Studio product shot of the Freud 12-186 double flute straight router bit, featuring a thick 1/2-inch silver shank and a wide red Perma-SHIELD coated cutter head with large carbide flutes.
Studio product shot of the Freud 12-186 double flute straight router bit, featuring a thick 1/2-inch silver shank and a wide red Perma-SHIELD coated cutter head with large carbide flutes.
Technical diagram showing a cross-section of a wood cut, indicating a wide slot width of 1-3/8 inch and a cutting depth of 1-1/4 inch for model number 12-186.
3D computer graphic showing a block of wood with a wide, deep square channel groove cut into the top surface, illustrating the heavy material removal profile of the bit.
Top-down diagram of the router bit profile showing the large circular cutting path and the arrangement of the two grey carbide cutting flutes against a red background.
Studio product shot of the Freud 12-186 double flute straight router bit, featuring a thick 1/2-inch silver shank and a wide red Perma-SHIELD coated cutter head with large carbide flutes.
Freud

Freud Straight Router Bit 12-186 1-3/8 Inch Double Flute (1/2 Inch Shank TiCo Carbide 16000 RPM CNC Slab Surfacing Grooving Plywood Joinery)

Only 2 left
SKU: 12-186
$29.97 USD

Description

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Freud 12-186 1-3/8 Inch Double Flute Straight Router Bit

The Freud 12-186 is a 1-3/8-inch overall cutting diameter double flute straight router bit engineered for wide surface flattening, slab leveling, deep dado jointing, and rapid stock removal. Built with a rigid 1/2-inch shank and a 1-1/4-inch carbide cutting height, this 2-cutter tool features end-relieved tip geometry that enables clean, burn-free plunge entries into timber stock and composite panels. Tipped with TiCo™ Hi-Density Micrograin Carbide and computer-balanced for chatter-free rotation, it operates at speeds up to 16,000 RPM across CNC machinery, router tables, or handheld routers in solid hardwoods, softwoods, plywood, and wood composites.

Best Used For:

  • Live-Edge Slab & Spoilboard Surfacing: Leveling wide hardwood slabs, workbench tops, and CNC spoilboard surfaces with minimal overlap ridges.
  • Wide 1-3/8-Inch Dado & Groove Milling: Cutting extra-wide dado channels, joinery slots, and rabbets in heavy timber frames and paneling.
  • Plunge Pocketing & Deep Material Evacuation: Plunging directly into wood stock to route wide interior cutouts, deep pockets, and blind mortises.

Key Performance & Safety Features

  • TiCo™ Hi-Density Micrograin Carbide: Custom-formulated titanium-cobalt carbide tips maintain sharpness under continuous heavy thermal loads.
  • Heavy-Duty 1/2-Inch Shank: Rigid 1/2-inch steel shank diameter minimizes tool flex, runout, and cutter vibration during high-torque surfacing.
  • End-Relieved Plunge Cut Tip: Precision-ground end face permits vertical drilling entry for starting internal grooves and blind mortises.
  • Dual-Flute Precision Balance: Computer-balanced twin cutters distribute chip load evenly to produce smooth sidewalls and flat bottom cuts.
  • Optimized Hook & Shear Angles: Shear-angled cutting geometry slices through wood fibers cleanly to minimize chip tearout and burning.
  • 16,000 RPM Maximum Speed Rating: Precision-balanced body design enables stable, chatter-free rotation under demanding feed rates.

What's Included

  • (1) Freud 12-186 1-3/8" Double Flute Straight Router Bit with 1/2" Shank

Technical Specifications

Brand Manufacturer Freud® Tools
Model Part Number OEM SKU 12-186
Overall Cutting Diameter (D) 1.375 inches (1-3/8" / 34.9 mm)
Shank Diameter (A) 0.500 inches (1/2" / 12.7 mm)
Carbide Cutting Height (h) 1.250 inches (1-1/4" / 31.8 mm)
Overall Tool Length (H) 3.000 inches (3" / 76.2 mm)
Number of Carbide Cutters 2 Flute Carbide Cutters
Cutting Style Profile Straight / Plunge Cutting Edge
Maximum Operating Speed 16,000 RPM
Cutter Metallurgy Material TiCo™ Hi-Density Micrograin Carbide Tipped
Primary Machine Compatibility CNC Routers, Handheld Routers, Router Tables

Pro-Tip: Due to the large 1-3/8-inch cutting diameter, dial back router speed to 16,000 RPM or lower and step down pass depths to 1/4 inch or less to protect the motor and maintain control during wide surfacing passes.