CMT Conical Spiral Bit - 1/4 in. Diameter, Z2, 1/4 in. Shank is a solid carbide, two-flute conical spiral router bit engineered for precision 2D and 3D CNC profiling and carving. With a 3 deg. conical angle and right-hand rotation, this bit produces excellent surface finishes on the underside of the workpiece while directing chips upward and away from the cut - keeping channels clean and reducing recutting. Designed to handle plastic, aluminum, and wood, it is a versatile choice for CNC routing machines and router table setups that demand consistent, repeatable tapered profiles and conical contours.

Key Features

• Solid Carbide (HWM) Construction - manufactured entirely from premium micrograin solid carbide, delivering superior wear resistance and longer service life compared to carbide-tipped alternatives, allowing multiple resharpenings over the tool's lifespan.
• 3 deg. Conical Angle with 1/8 in. Radius - creates precise tapered profiles and smooth conical contours essential for accurate 2D and 3D CNC carving and profiling work.
• Two-Flute (Z2) Geometry - the dual-flute configuration balances chip evacuation and cutting speed, producing a clean, finished surface on the lower side of the workpiece without excessive heat buildup.
• Upward Chip Ejection - the spiral geometry actively lifts chips out of the cut zone, reducing recutting, minimizing heat, and keeping the work area cleaner during extended CNC routing sessions.
• Excellent Finish on the Lower Side - the cutting geometry is specially optimized to leave a smooth, professional surface on the bottom face of the workpiece, reducing or eliminating secondary finishing steps.
• Right-Hand Rotation (RH) - compatible with standard CNC spindles and router tables without requiring special toolholders or adapters.
• 1/4 in. Shank with 2 in. Cutting Height - the long 2 in. cutting height gives the bit reach for deep 3D carving passes, while the 1/4 in. shank fits widely available collets on CNC routers and handheld routers.
• 4 in. Total Length - provides clearance for complex 3D toolpaths and workholding fixtures without sacrificing rigidity.

Why This Product

• Specially designed for 2D and 3D CNC profiling and carving - this is not a general-purpose bit. The conical spiral geometry is purpose-built for the tapered cuts, relief carving, and contoured profiles that CNC work demands in wood, plastic, and aluminum.
• The upward chip ejection combined with an excellent finish on the lower side of the workpiece means less cleanup time and fewer finishing passes - a direct productivity gain for production CNC environments.
• Full solid carbide construction throughout the cutting body means the bit can be resharpened repeatedly, extending the investment over time rather than replacing carbide-tipped tooling that degrades at the tip first.
• With a 2 in. cutting height and 4 in. total length on a 1/4 in. shank, this bit provides the reach and collet compatibility needed for deep relief work and intricate 3D carving without requiring a tool change to a larger shank.

Specifications

• Manufacturer Part Number: 152.127.635
• Brand: CMT Orange Tools
• Product Type: Solid Carbide Conical Spiral Bit
• Diameter: 1/4 in.
• Cutting Height: 2 in.
• Total Length: 4 in.
• Radius: 1/8 in.
• Shank: 1/4 in.
• Angle: 3 deg.
• Number of Flutes: 2
• Rotation: Right-Hand (RH)
• Blade Material: Solid Carbide (HWM)
• Class: Router Cutter

Approved Applications

• 2D CNC Profiling in Wood, Plastic, and Aluminum
• 3D CNC Carving and Relief Work
• Conical Profile Routing
• Tapered Channel Cutting in Laminates and Composites
• CNC Routing of Plastic and Aluminum Sheet Stock