CMT Chamfer Bits with Insert Knives - 1-7/64" Diameter, 30 deg. Angle, 1/4" Shank by CMT are precision-engineered bevel and chamfer router bits designed for edge profiling on hardwood, MDF, laminates, and more. Featuring two replaceable carbide insert knives secured by special Torx screws, these guided chamfer bits deliver clean, consistent 30 deg. beveled edges on portable routers and CNC machining centers alike. The integrated ball bearing guide ensures repeatable chamfer depth without the need for counter-profiles, making this bit a reliable choice for decorative edgework, laminate trimming, and chamfering applications where precision and economy of tooling cost both matter.

Key Features

• Replaceable Insert Knives (2 per bit) - each hardwood-rated carbide knife is sharpened on all 4 sides, providing 3 extra new edges per knife, so you extend tool life and reduce replacement costs significantly compared to fixed-blade router bits.
• Special Torx Screw Fixation - knives are locked securely in place with dedicated Torx fasteners, ensuring the inserts stay precisely indexed during cutting for accurate, repeatable bevel profiles.
• Ball Bearing Guide - the integrated bearing pilot on this type 659 guided chamfer bit controls cutting depth automatically, eliminating the setup time and skill required for counter-profile jigs.
• 30 deg. Chamfer Angle - a fixed 30 deg. cutting geometry produces consistent, clean bevel edges on every pass, ideal for decorative trim work and precision laminate edging.
• Hardwood-Grade Carbide (HW) Knives - the HW material grade handles hardwood, MDF, chipboard, laminates, and plastics with minimal edge degradation, supporting extended production runs between knife rotations.
• Right-Hand Rotation - standard RH rotation is compatible with the vast majority of portable routers and CNC machining centers equipped with a 1/4" collet.
• 25/64" Cutting Height - the 25/64" depth of cut is sized for edge chamfering and bevel trimming tasks without removing excessive material, giving you controlled, repeatable results on thin laminates and solid stock alike.

Why This Product

• The 4-sided reversible insert knives mean you get up to 3 additional cutting edges from each knife before replacement is needed - a practical advantage for shops running high volumes of chamfering or bevel edging work where tooling cost adds up quickly.
• The ball bearing guide on this type 659 bit removes guesswork from setup: the bearing rides the workpiece edge to self-index the 30 deg. chamfer, making it accessible for portable router use as well as CNC production environments.
• With HW carbide insert knives, this bit handles a broad range of materials - from hardwood and softwood to MDF, laminates, chipboard, and plastics - without requiring a material-specific bit change mid-project.
• At 1/4" shank diameter and 2-9/16" overall length, this chamfer bit fits compact portable routers with 1/4" collets and standard router tables, giving woodworkers and cabinetmakers a versatile edge-profiling tool without requiring a large shank collet upgrade.

Specifications

• Manufacturer Part Number: 659.031.11
• Brand: CMT Orange Tools
• Chamfer Angle: 30 deg.
• Cutting Diameter: 1-7/64"
• Cutting Height: 25/64"
• Total Length: 2-9/16"
• Shank Diameter: 1/4"
• Number of Knives: 2
• Knife Material: HW (Hardwood-Grade Carbide)
• Rotation: Right-Hand (RH)
• Bit Type: Guided (Ball Bearing) - Type 659

Approved Applications

• Chamfering and bevel edging on solid hardwood and softwood
• Precision laminate edge trimming and profiling
• Decorative edge chamfering on MDF and chipboard panels
• Quick rounded and beveled edge production in high-volume CNC machining environments
• Specialist applications requiring economy of replaceable insert tips