CMT 316.070.12 Countersink for 4 Flute Drills - 9/32" Diameter, Left-Hand Rotation is a precision carbide countersink engineered by CMT for use with 4-flute dowel drill configurations in high-productivity woodworking operations. Featuring a 45 deg. cutting angle and left-hand (LH) rotation, this compact countersink is purpose-built for CNC boring machines and multi-spindle panel processing equipment where accurate countersinking in a single pass is critical. The hard material (HW) construction delivers consistent performance across engineered wood panels, hardwood, and coated substrates - making it a reliable choice for cabinet shops and production facilities running LH-rotation spindle setups.

Key Features

• Hard Material (HW) Construction - provides long-lasting edge retention and resistance to premature wear, reducing tool change frequency during high-volume production runs.
• 45 deg. Cutting Angle - produces a clean, precise countersink profile suited for flush-fitting fasteners and hardware, minimizing surface tearout on finished panels.
• Left-Hand (LH) Rotation - designed specifically for left-hand spindles found on multi-spindle CNC boring centers, ensuring proper chip ejection and clean entry geometry on every bore.
• 2-Tooth Cutting Configuration - two precision cutting edges distribute load evenly across the workpiece, supporting stable, vibration-reduced cutting even at higher feed rates typical of production environments.
• 16mm Cutting Diameter with 7mm Bore - the bore diameter accommodates standard CNC boring spindle tooling interfaces, while the 16mm cutting diameter delivers an appropriately sized countersink for common woodworking fasteners and hardware.
• Compact 15mm Total Length - the short profile fits within tight spindle-to-spindle spacing on multi-boring heads, allowing use in dense tool layouts without interference.

Why This Product

• Matched for left-hand spindle boring machines - if your CNC boring center or multi-spindle panel processing machine runs LH rotation spindles, this countersink is built specifically for that configuration, eliminating the risk of using a mismatched right-hand tool that could cause poor chip flow or surface damage.
• Engineered for 4-flute drill compatibility - pairs directly with 4-flute dowel drills to allow countersinking in the same pass, cutting cycle time and reducing the number of tool positions required on the machine.
• Hard material (HW) carbide construction means the cutting edges hold geometry longer under repetitive drilling cycles on dense engineered wood, coated panels, and hardwood - helping maintain consistent countersink depth across large production runs.
• The 7mm bore diameter and 15mm total length are dimensioned for common CNC boring center spindle interfaces, making this a practical drop-in solution for shops that already run CMT or compatible boring tooling systems.

Specifications

• Manufacturer Part Number: 316.070.12
• Brand: CMT Orange Tools
• Cutting Angle: 45 deg.
• Cutting Diameter: 16mm
• Bore Diameter: 7mm
• Total Length: 15mm
• Rotation: Left-Hand (LH)
• Number of Teeth: 2
• Blade Material: Hard Material (HW)

Approved Applications

• Multi-Spindle CNC Boring Machines with Left-Hand Rotation Spindles
• CNC Boring Centers
• Panel Processing Centers
• Boring Machines with Adapter or Chuck
• Chipboard and Particleboard Panels
• MDF and HDF
• Hardwood and Softwood
• Plywood
• Laminates and Coated Panels