Studio product view of the Freud 18-106 router bit, featuring a 1/4 inch silver shank and a red Perma-SHIELD coated round nose cutting head with a 3/16 inch radius tip.
Retail packaging for the Freud 18-106 round nose bit, showing the red and black industrial branding, a diagram of the 3/16 inch radius profile, and icons indicating the 1/4 inch shank and TiCo carbide.
Technical diagram illustrating the cutting profile of the Freud 18-106 core box bit, showing a cross-section of a U-shaped groove cut into wood with a 3/8 inch width and a 3/16 inch radius.
Studio product view of the Freud 18-106 router bit, featuring a 1/4 inch silver shank and a red Perma-SHIELD coated round nose cutting head with a 3/16 inch radius tip.
Studio product view of the Freud 18-106 router bit, featuring a 1/4 inch silver shank and a red Perma-SHIELD coated round nose cutting head with a 3/16 inch radius tip.
Retail packaging for the Freud 18-106 round nose bit, showing the red and black industrial branding, a diagram of the 3/16 inch radius profile, and icons indicating the 1/4 inch shank and TiCo carbide.
Technical diagram illustrating the cutting profile of the Freud 18-106 core box bit, showing a cross-section of a U-shaped groove cut into wood with a 3/8 inch width and a 3/16 inch radius.
Studio product view of the Freud 18-106 router bit, featuring a 1/4 inch silver shank and a red Perma-SHIELD coated round nose cutting head with a 3/16 inch radius tip.
Freud

Freud 18-106 3/8 Inch Diameter Round Nose Router Bit 3/16 Inch Radius 1/4 Inch Shank Solid Carbide Core Box Fluting Sign Making CNC

Only 1 left
SKU: 18-106
$19.97 USD

Description

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Create Intricate Flutes and Professional Signage with Freud's Solid Carbide Core Box Bit

Add sophisticated detail to your woodworking projects with the Freud 18-106 3/8-Inch Diameter Round Nose Router Bit. Also known as a "Core Box" bit, this precision tool features a 3/16-inch radius, making it the perfect solution for cutting smooth, semi-circular grooves. It is exceptionally versatile, widely used for routing decorative flutes on millwork, adding classic accents to cabinet doors and drawer fronts, and engraving crisp, readable lettering for signs. Whether you are working with hardwood, softwood, plywood, or composites, this bit delivers a clean, polished finish that enhances the visual appeal of any piece.

Constructed from Freud's Premier Solid Carbide, the 18-106 is engineered for maximum durability and edge retention. The solid carbide design provides superior rigidity, minimizing vibration and ensuring chatter-free cuts even at high RPMs. This makes it an ideal choice for the demanding feed rates of CNC machines, as well as the precision required in hand-held and table-mounted routers. With its ability to produce deep, clean grooves without burning, this bit is a staple for professional woodworkers and serious hobbyists alike.

Key Features

  • 3/16-Inch Radius Profile: Creates perfectly round 3/8-inch wide grooves for fluting and veining.
  • Premier Solid Carbide: Solid construction ensures superior hardness, sharp edge retention, and long life.
  • Versatile Application: Ideal for sign lettering, decorative fluting, and finger pulls.
  • Multi-Machine Compatibility: Engineered for use in CNC, automatic, hand-held, and table-mounted routers.
  • Material Versatility: Cuts cleanly through hardwoods, softwoods, plywoods, and composite materials.
  • Precision Balanced: Designed to run smoothly at high RPMs (up to 24,000) for a flawless finish.
  • Double Flute Design: Two cutting edges ensure efficient chip removal and smoother surfaces.

What's Included:

  • (1) 3/8" Dia. Round Nose Router Bit with 1/4" Shank (18-106)

Specifications

Manufacturer Freud
Part Number 18-106
Bit Type Round Nose / Core Box
Overall Diameter (D) 3/8 Inch
Radius (R) 3/16 Inch
Shank Diameter (A) 1/4 Inch
Carbide Height (h) 3/8 Inch
Overall Length (H) 1-13/16 Inches
Number of Cutters 2
Max RPM 24,000
Material Premier Solid Carbide
Pro-Tip: When using a core box bit to create drain grooves (for example, on a cutting board), use a plunge router and ramp into the cut gradually. To prevent burning at the bottom of the groove where the bit velocity is effectively zero, keep the router moving at a consistent pace and avoid pausing in one spot.