Product Description
The CMT 81103 Contractor Straight Bit is a single-flute, carbide-tipped routing bit engineered for precision slotting, channel routing, and groove cutting in wood and wood composite materials. With a 1/8 in. cutting diameter, a 5/16 in. cutting height, and a 1/4 in. shank, this compact straight bit delivers clean, accurate passes in tight spaces where larger bits cannot reach. Hi-density carbide-tipped cutting edges ensure smooth performance and repeatable results across solid hardwood, softwood, plywood, MDF, and similar sheet goods - making it a reliable choice for cabinetmakers, finish carpenters, and woodworking professionals who demand consistency at every cut.
Key Features
- Hi-Density Carbide-Tipped Cutting Edges - hard-wearing carbide tips stay sharp through extended routing sessions, delivering a smooth, precise cut with minimal tearout on wood and wood composites.
- Single-Flute Design (1 Tooth) - the single cutting edge maximizes chip clearance in each pass, reducing heat buildup and preventing clogging when routing narrow channels or deep slots.
- Engineered Chip Clearance Geometry - the body profile is designed for efficient evacuation of waste material, helping maintain cut quality and reducing the chance of burning on sensitive wood surfaces.
- 1/8 in. Cutting Diameter - a narrow profile sized for fine detail work, precision inlay channels, and narrow grooves that standard router bits cannot produce.
- 1/4 in. Shank - compatible with a wide range of handheld routers, router tables, and CNC routing machines fitted with a 1/4 in. collet, providing broad versatility across setups.
- Right-Hand Rotation (RH) - standard right-hand rotation matches virtually all conventional router configurations, making this bit a straightforward drop-in for most workshops.
- HW (Hard Metal / Carbide) Cutting Material - the carbide tip material resists wear when cutting abrasive materials such as MDF and composite panels, extending service life compared to high-speed steel alternatives.
Why This Product
- The 1/8 in. cutting diameter makes this bit one of the narrowest straight routing profiles available, filling a specific need for fine inlay work, wire-routing channels, and tight decorative grooves where wider bits would remove too much material.
- Hi-density carbide-tipped construction paired with an efficient chip clearance geometry means woodworkers get cleaner cuts in wood composites and sheet goods without the repeated passes or cleanup that dull or clogged bits require.
- The 1/4 in. shank offers compatibility across handheld routers, router tables, and CNC routing machines, giving this single bit useful flexibility in both hand-guided and machine-guided production environments.
- A 2 in. total length and 5/16 in. cutting height keep the bit rigid and well-supported during operation, reducing deflection and promoting straight, accurate channels even in harder wood species.
Specifications
- Manufacturer Part Number: 81103
- Brand: CMT Orange Tools
- Diameter: 1/8 in.
- Cutting Height: 5/16 in.
- Total Length: 2 in.
- Shank: 1/4 in.
- Number of Teeth: 1
- Material: HW (Carbide-Tipped)
- Rotation: Right-Hand (RH)
- Product Type: Contractor Straight Bit
Approved Applications
- Making slots and routing channels in wood and wood composites
- Narrow groove cutting and fine detail routing
- Inlay channel routing
- Dadoes, rabbets, and precision straight cuts
- Template routing with a guide bushing or bearing setup
Frequently Asked Questions
What materials is the CMT 81103 designed to cut?
This bit is designed for making slots and routing channels in wood and wood composites. The hi-density carbide-tipped cutting edges handle solid hardwood, softwood, plywood, MDF, and similar sheet materials cleanly and efficiently.
Is this bit compatible with my handheld router or router table?
Yes. The 1/4 in. shank is compatible with handheld routers, router tables, and CNC routing machines that accept a 1/4 in. collet. Verify that your router collet matches the 1/4 in. shank size before use.
Why is the single-flute design beneficial for narrow channel routing?
A single cutting tooth provides maximum chip clearance per revolution. In narrow-diameter bits like this 1/8 in. profile, that means waste material clears the cut more efficiently, reducing heat buildup and keeping the channel walls clean without burning or packing.
How does the 1/8 in. diameter differ from a standard straight bit, and when should I choose it?
The 1/8 in. cutting diameter is significantly narrower than common 1/4 in. or 1/2 in. straight bits. Choose this bit when your project requires fine inlay channels, wire-routing grooves, narrow decorative details, or any application where removing a small, precise amount of material is critical and a wider bit would cut too broadly.
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