Product Description
CMT Hinge Boring Bit 22 x 70mm Left-Hand Rotation is a precision-engineered boring bit from CMT designed specifically for drilling flat-bottom hinge cup holes required by European-style concealed hinge systems. Built with a carbide-tipped (HW) cutting head and a long 70mm overall length, this bit handles deeper boring applications in thicker cabinet components where standard-length bits fall short. The left-hand (LH) rotation makes it the correct choice for multi-spindle CNC boring machines and dedicated boring centers that run counter-clockwise spindles. Whether you are equipping a production cabinet shop or setting up a panel processing center, this hinge boring bit delivers repeatable, clean-walled cup holes in a wide range of wood-based panel materials.
Key Features
- Super-strength steel body with P.T.F.E.-coated spiral portion - the orange or black P.T.F.E. coating on the spiral flutes reduces friction and resin buildup, keeping the bit running cooler and cleaner during repeated hinge cup drilling cycles.
- HW (carbide-tipped) cutting head with precision balanced centre point - the carbide tip maintains cutting sharpness far longer than high-speed steel alternatives, while the balanced centre point starts each hole cleanly and prevents walking on panel surfaces.
- 2 precision-ground cutting edges (Z2) with negatively ground spurs - negatively set spurs shear the wood fibers at the perimeter of the hole before the body removes material, producing smooth bore walls and a flat bottom with no rough edges or tearout.
- 2 spiral flutes - efficiently evacuate chips from the bore during drilling, reducing clogging and maintaining consistent cutting performance across long production runs.
- 22mm diameter cutting head - matches the standard cup size required by the vast majority of European concealed hinges, ensuring accurate, press-fit or screw-mount hinge cups seat correctly in cabinet doors and face frames.
- 70mm total length (long-series) - provides the reach needed for boring hinge cups in thicker cabinet components and panel stacks that a standard-length bit cannot accommodate.
- 10 x 26mm parallel shank with driving flat and length-adjusting screw - the driving flat prevents slippage in machine chucks and boring head collets, while the length-adjusting screw allows precise depth setting for consistent flat-bottom cup depth across every spindle in a multi-spindle machine.
- Left-hand (LH) rotation - engineered for counter-clockwise spindles found on dedicated hinge boring machines and CNC boring centers, ensuring correct chip ejection direction and clean cutting geometry.
Why This Product
- Built for European concealed hinge installation at production scale - the 22mm diameter and flat-bottom cutting geometry produce the exact cup profile that European-style concealed hinges require, eliminating the need for secondary cleanup operations between boring and hinge insertion.
- Long-series length solves thicker-panel boring challenges - at 70mm total length, this bit reaches depths that standard hinge boring bits cannot, making it the correct tool when working with thicker door slabs, stacked panels, or machines with extended spindle-to-surface distances.
- Carbide-tipped head with P.T.F.E.-coated flutes extends tool life in demanding materials - the HW carbide head resists wear in abrasive materials such as chipboard and MDF, while the coated spiral reduces heat and resin adhesion, lowering the frequency of bit changes during high-volume runs.
- Parallel shank with driving flat and adjusting screw ensures repeatable depth across every spindle - in multi-spindle boring machines, consistent cup depth is critical for uniform hinge alignment; the length-adjusting screw makes fine-tuning quick and reliable without removing the bit from the machine.
Specifications
- Manufacturer Part Number: 369.220.12
- Brand: CMT Orange Tools
- Diameter: 22mm
- Total Length: 70mm
- Shank: 10 x 26mm
- Rotation: Left-Hand (LH)
- Number of Teeth: 2
- Spurs: 2
- Tooth Geometry: Negatively ground spurs
- Blade Material: HW (Carbide-Tipped)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinge installation
- Cabinet door hinge mounting in production and custom cabinet manufacturing
- Hinge cup boring in solid hardwood, softwood, chipboard, MDF, and plywood panels
- Thick-panel boring applications requiring a long-series bit
- Multi-spindle CNC boring machine operations with left-hand spindles
- CNC boring center and panel processing center production runs
- Boring machine use with adapter or chuck
- Drill press and handheld drill applications with parallel shank compatibility
Frequently Asked Questions
Why does this hinge boring bit have left-hand (LH) rotation, and how do I know if my machine needs it?
Left-hand rotation means the bit is designed to spin counter-clockwise. Dedicated European-style hinge boring machines and many multi-spindle CNC boring centers use LH spindles for specific boring positions - particularly on the left-hand side of a multi-spindle head. Check your machine's spindle rotation direction at the positions where you plan to use this bit. Installing a LH bit on a RH spindle will cause the bit to back out of the chuck rather than cut cleanly.
What makes this a "long-series" hinge boring bit, and when is the 70mm length needed?
The 70mm total length distinguishes this bit from shorter standard-series hinge boring bits. The longer body is required when boring into thicker cabinet door components, when the machine's spindle-to-panel-surface distance is greater than a standard bit can bridge, or when stacked panel setups add distance between the spindle nose and the workpiece surface. The 70mm length ensures the cutting head reaches the panel surface with sufficient depth capacity to produce a complete flat-bottom hinge cup hole.
What is the purpose of the driving flat and length-adjusting screw on the 10 x 26mm shank?
The driving flat on the parallel shank prevents the bit from rotating within the machine chuck or boring head collet under cutting load, maintaining accurate hole positioning. The length-adjusting screw allows the operator to set and fine-tune the exact projection of the bit from the spindle nose, which directly controls the depth of the flat-bottom cup hole. This is especially important in multi-spindle machines where all spindles must produce identical cup depths for consistent hinge alignment across every door.
Which panel materials is this hinge boring bit compatible with?
The HW (carbide-tipped) cutting head and negatively ground spurs make this bit suitable for boring hinge cup holes in solid hardwood, softwood, chipboard, MDF, and plywood - the full range of materials commonly used in cabinet door and panel manufacturing. The carbide head maintains its cutting edge effectively in abrasive engineered panels such as chipboard and MDF, where high-speed steel bits dull significantly faster.
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