The CMT Solid Carbide Upcut Ball Nose Spiral Bit - 1/4 in. is a precision-ground, two-flute CNC router bit engineered for 3D profiling, sculpting, relief carving, and curved surface machining on a wide range of materials. Built entirely from a super-micrograin carbide formulation developed specifically for clean shearing and long edge retention, this bit delivers consistent performance across solid wood, wood composites, plastic materials, and laminates. The spherical 1/8 in. radius tip traces complex contours with exceptional smoothness, making it the go-to choice for CNC operators who demand fine surface quality on every pass.

Key Features

• Super-micrograin solid carbide construction - the special carbide formulation holds a keen cutting edge far longer than standard grades, reducing downtime for bit changes and allowing more resharpenings over the tool's life.
• Low-angle upcut spiral geometry - designed specifically to shear wood fibers cleanly rather than tear them, resulting in smoother finished surfaces and efficient chip ejection that keeps the cutting zone clear.
• Cooler running operation - the low-angle spiral promotes faster chip evacuation, which reduces heat buildup at the cutting edge and helps the carbide retain its sharpness through longer production runs.
• 1/8 in. ball nose radius - the spherical tip generates smooth, flowing 3D profiles and curved surfaces with minimal post-processing, ideal for sculpting, relief carving, and contoured panel work.
• Right-hand (RH) rotation with 2-flute design - balanced cutting forces and consistent chip load per flute translate to reduced vibration and improved surface finish on every routing pass.
• 1/4 in. shank and 1/4 in. cutting diameter - compatible with standard collets on CNC routers, router tables, and handheld routers, providing versatile machine compatibility without adapters.
• 1 in. cutting height on a 2-1/2 in. overall length - adequate reach for typical 3D relief and panel sizing work while maintaining rigidity and minimizing deflection during passes.

Why This Product

• The super-micrograin carbide formulation was created specifically to produce and hold a keen cutting edge, making this bit a reliable choice for production environments where consistent quality across multiple workpieces matters.
• The low-angle spiral geometry shears material cleanly and ejects chips efficiently - reducing heat accumulation and extending edge life, which lowers cost-per-cut compared to bits that dull quickly under similar conditions.
• With a 1/8 in. radius ball nose profile, this bit handles everything from smooth curved surface machining and 3D relief routing to panel sizing and copying work, covering a broad range of CNC applications in a single tool.
• Compatibility with solid wood, wood composites, plastic materials, and laminates means this bit can move between material types without requiring a tool change, supporting flexible shop workflows.

Specifications

• Manufacturer Part Number: 199.008.11
• Brand: CMT Orange Tools
• Product Type: Solid Carbide Upcut Ball Nose Spiral Bit
• Diameter: 1/4 in.
• Cutting Height: 1 in.
• Total Length: 2-1/2 in.
• Radius: 1/8 in.
• Shank: 1/4 in.
• Number of Teeth: 2
• Rotation: Right-hand (RH)
• Material: Solid Carbide (HWM - super-micrograin)

Approved Applications

• CNC 3D routing and profiling
• Curved surface machining
• Sculpting and relief carving
• Copying and panel sizing
• Routing on solid wood and wood composites
• Plastic material and laminate routing