Product Description
CMT Hinge Boring Bit 16 x 57.5mm Left-Hand Rotation is a precision carbide-tipped boring bit engineered for drilling flat-bottom hinge cup holes in cabinet doors and face frames. Designed for use on boring machines equipped with adaptors or chucks, this left-hand rotating bit delivers the clean, accurate results required for European-style concealed hinge installation. The combination of a tungsten carbide (HW) head, negatively ground spurs, and a PTFE-coated cutter body makes it a reliable choice for production woodworking in solid hardwood, softwood, MDF, chipboard, and plywood applications.
Key Features
- Super-strength steel body with PTFE coating - the cutter portion is coated with orange or black P.T.F.E., preventing pitch and glue buildup so the bit stays cleaner longer and delivers consistent performance over extended production runs.
- HW (tungsten carbide) head with precision balanced centre point - ensures accurate entry and a perfectly centered flat-bottom bore, reducing wandering and improving hole quality for tight-fitting hinge cup seating.
- 2 HW precision ground cutting edges (Z2) - dual carbide cutting edges provide balanced cutting action and smooth bore walls, which is essential for reliable European concealed hinge installation.
- 2 negatively ground spurs (V2) - the negative spur geometry scores the wood fibers ahead of the cutting edges, producing clean bore walls and sharp entry circles with minimal tearout on both faces of the workpiece.
- Left-hand (LH) rotation - purpose-built for left-hand spindle positions on multi-spindle boring machines, ensuring correct cutting geometry and preventing edge breakout on the specific side of the workpiece where it is applied.
- Parallel shank with driving flat and length adjusting screw - the 10 x 26mm shank design allows secure mounting in machine adaptors or chucks, and the adjusting screw enables precise depth setting for repeatable flat-bottom hole depth across production runs.
Why This Product
- Purpose-designed for flat-bottom hinge cup holes - the HW head geometry and negatively ground spurs produce the flat-bottom profile that European concealed hinges require, making this bit the correct tool for cabinet door and face frame hinge installation rather than a general-purpose alternative.
- Left-hand rotation for correct multi-spindle machine positioning - on machines with both left- and right-hand spindles, using a bit with the correct rotation is critical for clean cutting action; this LH bit eliminates tearout and poor bore quality caused by running the wrong rotation on a given spindle.
- Carbide construction with PTFE-coated body for production durability - HW cutting edges hold their edge longer than standard high-speed steel in dense sheet goods, MDF, and hardwoods, while the P.T.F.E. coating reduces resin adhesion and keeps the bit running freely under repetitive boring cycles.
- Parallel shank with driving flat and length adjusting screw for repeatable setup - the adjustable shank design means the bit can be set to an exact depth once and reliably reproduced across an entire cabinet batch, reducing setup time and rework.
Specifications
- Manufacturer Part Number: 317.160.12
- Brand: CMT Orange Tools
- Diameter: 16mm
- Total Length: 57.5mm
- Shank: 10 x 26mm
- Rotation: LH (Left-Hand)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth 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 on multi-spindle CNC boring machines
- Boring operations on machines equipped with adaptors or chucks
- Boring in solid hardwood, softwood, MDF, chipboard, and plywood
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 machine chucks or proprietary adaptors used on multi-spindle boring machines and CNC boring centers.
Why does the rotation direction matter for hinge boring bits?
On multi-spindle boring machines, individual spindles are designated as left-hand or right-hand rotating. Using a bit with the correct rotation for its spindle position ensures the cutting edges and spurs engage the material in the intended direction, producing clean bore walls and flat bottoms. Using the wrong rotation can result in poor surface quality and excessive tearout. This bit is specifically a left-hand (LH) rotation model.
What is the purpose of the negatively ground spurs on this bit?
The 2 negatively ground spurs score the wood fibers around the perimeter of the hole before the carbide cutting edges remove material. This scribing action produces a clean, defined entry circle and smooth bore walls with minimal tearout - a requirement for the precise fit that European concealed hinges demand.
What does the PTFE coating on the cutter portion do?
The orange or black P.T.F.E. coating applied to the cutter portion resists adhesion of pitch, resin, and glue. In production environments where the bit is used repeatedly on engineered wood products like MDF and chipboard - both of which can transfer adhesive residue - this coating helps the bit stay cleaner, reduces friction buildup, and extends the usable life of the tool between cleanings or sharpenings.
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