Product Description
CMT 317.140.11 Hinge Boring Bit - 14mm x 57.5mm, Right-Hand Rotation by CMT is engineered for precision flat-bottom hole boring in cabinet doors and face frames. Designed specifically for European-style concealed hinge installation, this 14mm carbide-tipped boring bit delivers clean, accurate hinge cup holes with a geometry that meets the requirements of modern cabinet hardware. Compatible with boring machines equipped with adaptors or chucks, the bit is built around a super-strength steel body with a tungsten carbide (HW) cutting head - giving woodworkers and cabinet shop professionals a reliable tool for high-volume panel processing as well as single-piece work.
Key Features
- HW (Tungsten Carbide) Cutting Head with Precision Balanced Centre Point - the carbide construction maintains sharp geometry through extended use in hardwood, softwood, chipboard, MDF, and plywood, reducing downtime from resharpening.
- 2 HW Precision Ground Cutting Edges (Z2) - dual carbide cutting edges produce a consistent, flat-bottom bore profile required for European concealed hinge cups, keeping each hole dimensionally accurate.
- 2 Negatively Ground Spurs (V2) - negatively ground spurs score the perimeter of the hole ahead of the cutters, producing clean bore walls with minimal tearout - even in veneered or laminated panels.
- Super-Strength Steel Body with PTFE Coating - the cutter portion is coated with orange or black P.T.F.E., which prevents pitch and glue buildup on the bit body, extending tool life and maintaining smooth chip evacuation.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10x26mm parallel shank with driving flat seats securely in chucks or adaptors, while the length adjusting screw allows precise depth setting for repeatable hinge cup depth across production runs.
- Right-Hand (RH) Rotation - matched to standard boring machine spindle direction, ensuring correct chip ejection and spur scoring in normal forward operation.
Why This Product
- The flat-bottom boring geometry is a non-negotiable requirement for European concealed hinge cups - this bit is built specifically for that application, not adapted from a general-purpose drill, so the hole geometry is correct from the first bore.
- The combination of 2 carbide cutting edges and 2 negatively ground spurs means the bit simultaneously scores the perimeter and clears the bottom of the hole cleanly, which matters in materials like MDF and veneered chipboard where tearout is a real concern.
- The parallel shank with driving flat and length adjusting screw makes this bit practical in both dedicated multi-spindle boring machines with adaptors and in drill press or chuck setups, giving shops flexibility across different machine configurations.
- The P.T.F.E. coating on the cutter portion resists adhesive and resin buildup common in cabinet production environments, helping the bit stay cleaner between cleanings and perform consistently across a full production shift.
Specifications
- Manufacturer Part Number: 317.140.11
- Brand: CMT Orange Tools
- Diameter: 14mm
- Total Length: 57.5mm
- Shank: 10x26mm
- Rotation: Right-Hand (RH)
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Spur Geometry: Negatively ground spurs
- Head Material: HW (Tungsten Carbide)
- Body Material: Super-strength steel
- Coating: Orange or black P.T.F.E. on cutter portion
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European-style concealed hinges
- Cabinet door hinge mortising and hinge cup boring
- Face frame hinge hole drilling in solid hardwood and softwood
- Hinge cup boring in chipboard, MDF, and plywood panel components
- 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 10x26mm parallel shank with driving flat is suited to standard chuck and adaptor configurations found on multi-spindle boring machines, CNC boring centers, and drill press setups.
Why does this bit have negatively ground spurs rather than standard spurs?
Negatively ground spurs are oriented to score the perimeter of the hole as the bit enters the workpiece, severing the wood fibers cleanly before the cutters remove material. This produces cleaner bore walls and reduces tearout, which is especially important in veneered panels, MDF, and laminated chipboard commonly used in cabinet construction.
What is the purpose of the length adjusting screw on the shank?
The length adjusting screw allows the operator to set and lock the bit at a precise projection length within the chuck or adaptor. This enables consistent, repeatable hinge cup depth across multiple holes or an entire production run without re-measuring each setup.
What does the P.T.F.E. coating on the cutter portion do?
The orange or black P.T.F.E. coating applied to the cutter portion of the bit resists the buildup of pitch, resin, and adhesive that commonly accumulates during cabinet production work. Keeping the cutting surfaces cleaner for longer helps maintain cutting performance and reduces the frequency of cleaning stops during production.
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