CMT 812.158.11 Straight Bit Long Series - 5/8" Diameter, 1/4" Shank is a professional-grade long-series straight router bit from CMT, engineered for deep, precise cutting in wood, sheet goods, and composite materials. With a 1 1/4" cutting height and 2-tooth micrograin carbide construction, this bit delivers clean, accurate results in dadoes, grooves, template routing, and panel joinery - reaching depths that standard-length bits simply cannot achieve. Designed for right-hand rotation and compatible with 1/4" collet routers, this long-series straight bit is a go-to choice for woodworkers and cabinetmakers who demand consistent performance under heavy workloads.

Key Features

• Micrograin Carbide Cutters on Special Fatigue Proof Steel - the combination of premium carbide grade and impact-resistant steel body means these double-faced cutters maintain sharpness and structural integrity even during demanding, continuous routing sessions.
• Long Series Design with 1 1/4" Cutting Height - reaches deeper into the workpiece than standard-length straight bits, making it ideal for full-depth dadoes, deep grooves, and through-cuts in thick stock without multiple passes.
• 2-Tooth Double-Faced Cutter Geometry - produces a smooth, precise cut and a beautifully clean edge on the finished piece, reducing the need for additional sanding or cleanup on the cut surface.
• Exceptional Chip Ejection - engineered flute geometry clears waste material efficiently, allowing for cleaner, more constant cutting and reducing heat buildup during extended use.
• CMT Orange Shield Non-Stick PTFE Coating - the trademark orange surface treatment resists resin, pitch, and other residue buildup, helping the bit run cooler, stay cleaner, and last longer between sharpenings.
• Right-Hand Rotation (RH) - compatible with standard handheld routers, router tables, and CNC routing machines equipped with a 1/4" collet, ensuring broad machine compatibility.

Why This Product

• The long-series configuration provides 1 1/4" of usable cutting height in a compact 2 3/4" total length, giving woodworkers access to true deep-cut capability without requiring a specialized or oversized router setup.
• Micrograin carbide construction with fatigue-proof steel withstands heavy, repeated workloads - making this bit a reliable choice for production environments, shop use, and demanding DIY projects where bit longevity matters.
• The non-stick PTFE coating actively reduces pitch and resin accumulation during cuts through hardwoods, MDF, melamine, and laminates, cutting down on mid-session cleaning and keeping performance consistent throughout use.
• Exceptional chip ejection keeps the cut path clear during deep straight routing, which directly improves cut quality, reduces burning, and supports more consistent results when working in dados, grooves, and panel joinery applications.

Specifications

• Manufacturer Part Number: 812.158.11
• Brand: CMT Orange Tools
• Diameter: 5/8"
• Cutting Height: 1 1/4"
• Total Length: 2 3/4"
• Shank: 1/4"
• Number of Teeth: 2
• Material: HW (Micrograin Carbide)
• Rotation: Right-Hand (RH)
• Product Type: Straight Bit Long Series

Approved Applications

• Deep straight cuts in solid hardwood and softwood
• Dadoes and grooves in plywood, MDF, and chipboard
• Template routing operations
• Panel joinery and edge work in laminates and melamine
• Through-cuts and full-depth passes in thick stock
• Plastic and composite material routing