Product Description
CMT Hinge Boring Bit 14 x 57.5mm Left-Hand Rotation by CMT is a precision-engineered boring bit designed specifically for drilling flat-bottom hinge cup holes in cabinet doors and face frames. Built to the exacting tolerances required for European-style concealed hinge installation, this 14mm diameter bit features a tungsten carbide (HW) cutting head, 2 precision-ground cutting edges, and 2 negatively ground spurs that work together to produce clean, accurate bores in a wide range of panel materials. Left-hand rotation makes it the correct choice for multi-spindle boring machines and CNC boring centers equipped with LH spindles, adaptors, or chucks.
Key Features
- Tungsten Carbide (HW) Cutting Head - carbide construction maintains a sharp, precise edge through extended production runs, reducing downtime for tool changes and delivering consistent hole quality across batch work.
- 2 Precision-Ground Cutting Edges (Z2) - balanced dual cutting geometry ensures smooth material removal and a flat bore bottom, which is essential for proper seating of European concealed hinges.
- 2 Negatively Ground Spurs (V2) - score the workpiece perimeter cleanly before the cutters advance, minimizing tearout on cabinet door faces and producing crisp hole walls in chipboard, MDF, plywood, and solid wood.
- Super-Strength Steel Body with PTFE Coating - the cutter portion is coated with orange or black P.T.F.E., which resists pitch and resin buildup so the bit runs freely and consistently without frequent cleaning stoppages.
- Precision Balanced Centre Point - the HW centre point self-positions accurately at the layout mark, reducing wander at entry and keeping hole placement tight to tolerance across repeated operations.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10 x 26mm shank locks securely in machine adaptors or chucks and allows fine depth adjustment, giving operators precise control over bore depth without re-fixturing.
- Left-Hand (LH) Rotation - matches the spindle direction of LH-configured boring machines, ensuring correct cutting action, smooth chip evacuation, and safe tool engagement.
Why This Product
- The 14mm diameter and flat-bottom bore geometry are the standard requirement for European concealed hinge cups - this bit produces the precise pocket geometry that concealed hinges need to seat correctly and function without play.
- The combination of negatively ground spurs and a carbide cutting head means cabinet makers working with surface-finished MDF or veneered chipboard get a clean entry and exit without edge chipping that would require rework.
- The parallel shank with driving flat and length adjusting screw gives woodworkers and production operators repeatable depth control across every spindle in a multi-spindle setup, reducing variation from door to door.
- Left-hand rotation is required for correctly configured LH spindles on boring machines and CNC boring centers - using this bit in the right machine eliminates the risk of the shank backing out under cutting forces, keeping the operation safe and accurate.
Specifications
- Manufacturer Part Number: 317.140.12
- Brand: CMT Orange Tools
- Diameter: 14mm
- Total Length: 57.5mm
- Shank: 10 x 26mm
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Spur Geometry: Negatively ground spurs
- Material: HW (Tungsten Carbide)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes in cabinet doors and face frames
- European concealed hinge installation
- Cabinet door hinge mounting in production and custom shop environments
- Use in boring machines equipped with adaptors or chucks
Frequently Asked Questions
What machines is this hinge boring bit compatible with?
This bit is designed for boring machines equipped with adaptors or chucks. The 10 x 26mm parallel shank with driving flat and length adjusting screw allows it to be mounted securely in a wide range of LH-configured spindle setups, including multi-spindle boring machines and CNC boring centers fitted with LH spindles.
Why does this bit use left-hand (LH) rotation, and how do I know if I need it?
Left-hand rotation means the bit is designed to cut when spinning counter-clockwise, which is the spindle direction of LH-configured boring machine spindles. If your machine or specific spindle position is designated LH, you must use a LH bit to achieve correct cutting action, proper chip evacuation, and secure shank retention. Using an RH bit on an LH spindle will not cut properly and is unsafe.
What is the purpose of negatively ground spurs on a hinge boring bit?
Negatively ground spurs score the material at the perimeter of the hole before the main cutting edges remove the core. This action severs the wood or panel fibers cleanly at the bore wall, which minimizes tearout and produces a smooth, defined edge - a critical requirement when boring into finished cabinet door faces or veneered panels where surface quality matters.
What does the PTFE coating on the cutter portion do?
The orange or black P.T.F.E. coating applied to the cutter portion reduces friction and resists adhesion of pitch, resin, and glue residue. In production environments where the bit is used continuously, this coating helps maintain consistent performance by preventing buildup that would otherwise increase cutting resistance and reduce bore quality over time.
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