Product Description
The CMT Contractor Mortising Bit - 5/8 in. Diameter, 1/4 in. Shank (80105) is a professional-grade router bit engineered for precise flat-bottom mortising in woodworking applications. Designed for hinge mortising, lock pocket routing, and loose-tenon joinery, this 2-flute carbide bit delivers clean, splinter-free cuts with smooth bottoms in both natural wood and wood composite materials. Whether mounted in a handheld router, router table, or CNC routing machine, it provides the control and edge quality that contractors and cabinetmakers depend on for repeatable, production-quality results.
Key Features
- Hi-Density Carbide Cutting Edges - delivers strong, consistent performance in mortising applications, eliminating splintered edges and rough bottoms that require rework or sanding.
- Works Well on Natural Wood and Wood Composites - a single bit handles solid hardwood, softwood, MDF, plywood, chipboard, and laminated panels, reducing the need to swap tooling between materials.
- 2-Flute (2-Tooth) Configuration - balanced twin cutting edges promote smooth chip evacuation and steady feed rates, helping you maintain clean slot walls and precise mortise geometry.
- Right-Hand Rotation - compatible with the standard rotation direction of most handheld routers, router tables, and CNC spindles, so no special setup or adapter is needed.
- 1/4 in. Shank - fits a wide range of compact and mid-size router collets, giving versatile machine compatibility for job site and shop use alike.
- 25/32 in. Cutting Height - provides sufficient depth capacity for common hinge mortises and lock pockets without multiple pass setups in many typical joinery applications.
- Compact 2 in. Total Length - keeps the bit close to the collet for added rigidity and reduced vibration, contributing to straighter mortise walls and a cleaner finished pocket.
Why This Product
- Clean mortises without rough bottoms - the hi-density carbide edges are specifically designed to leave flat, smooth mortise floors and splinter-free walls, so you spend less time on cleanup and finishing.
- One bit, many materials - from solid hardwood doors to MDF cabinet panels and laminated surfaces, this bit is built to perform across the wood and composite materials most often encountered in residential and commercial joinery work.
- Fits routers you already own - the standard 1/4 in. shank makes this bit immediately usable with the vast majority of handheld routers and router tables without purchasing a separate adapter or collet.
- Purpose-built for mortising tasks - unlike general-purpose straight bits, this contractor mortising bit is optimized specifically for hinge mortising, lock pockets, and slot mortising, delivering geometry and edge performance matched to those demanding applications.
Specifications
- Manufacturer Part Number: 80105
- Brand: CMT Orange Tools
- Diameter: 5/8 in.
- Cutting Height: 25/32 in.
- Total Length: 2 in.
- Shank: 1/4 in.
- Number of Teeth: 2
- Material: Carbide (HW)
- Rotation: Right-Hand (RH)
- Product Type: Mortising Bit
Approved Applications
- Hinge Mortising
- Lock Pocket Routing
- Slot Mortising
- Loose-Tenon Joinery
- Flat-Bottom Mortise Routing in Solid Wood and Wood Composites
Frequently Asked Questions
What router collet size does this mortising bit require?
This bit has a 1/4 in. shank and requires a 1/4 in. collet on your router. It is compatible with handheld routers, router tables, and CNC routing machines that accept a 1/4 in. collet.
Can this bit be used on MDF, plywood, and laminated panels - or only solid wood?
Yes. The hi-density carbide cutting edges are designed to work well on both natural wood and wood composites, including MDF, plywood, chipboard, laminates, and melamine, in addition to solid hardwood and softwood.
How deep a mortise can this bit cut in a single pass?
The cutting height is 25/32 in., which represents the maximum depth of cut this bit can achieve. For mortises shallower than 25/32 in. - such as standard hinge mortises - depth of cut is simply set by your router's depth stop.
Is this bit suitable for use on a CNC routing machine?
Yes. The right-hand rotation and 1/4 in. shank are compatible with CNC routing spindles that accept 1/4 in. tooling. The 2-flute carbide configuration provides the consistent edge performance needed for repeatable CNC mortising operations in wood and wood composites.
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