Product Description
The CMT Hinge Boring Bit 14 x 70mm Right-Hand (RH) is a premium carbide-tipped (HW) boring tool engineered for drilling precise flat-bottom hinge cup holes required by European-style concealed hinge installations. Built on a super-strength steel body with a PTFE-coated spiral, this 14mm diameter bit delivers clean, accurate bores in cabinet doors and panels - making it the go-to choice for cabinetmakers, millwork shops, and CNC operators working with European 32mm system joinery.
Key Features
- Carbide (HW) Cutting Head with Precision Balanced Centre Point - the tungsten carbide head stays sharp through extended production runs and delivers a consistently centered bore entry, reducing setup time and scrap in high-volume cabinet work.
- 2 Precision-Ground Cutting Edges (Z2) with Negatively Ground Spurs - the negatively set spurs score the perimeter of the hole before material is removed, producing clean bore walls and a flat bottom with minimal tearout - critical for a flush-fitting hinge cup seat.
- PTFE-Coated Spiral Flutes - the orange or black PTFE coating on the spiral portion resists pitch and adhesive buildup, keeping chips flowing freely and extending tool life between cleanings during glued or laminated panel drilling.
- 2 Spiral Flutes for Efficient Chip Evacuation - dual flutes pull waste material out of the bore quickly, preventing clogging and reducing heat buildup when boring repeatedly through chipboard, MDF, or solid hardwood.
- 10 x 26mm Parallel Shank with Driving Flat and Length Adjusting Screw - the standardized parallel shank mounts securely in multi-spindle boring machines, CNC boring centers, and drill press chucks, while the adjusting screw allows precise depth setting for consistent hinge cup depth across every door.
- Right-Hand (RH) Rotation - matches the standard spindle direction of the vast majority of boring machines and handheld drills, ensuring immediate compatibility without adapters.
- Long-Series 70mm Total Length - the extended overall length provides clearance for deeper cabinet components and thicker door stiles, allowing hinge cup boring in applications where shorter bits cannot reach.
Why This Product
- Designed specifically for European concealed hinge installation - the 14mm bore diameter and flat-bottom geometry match the cup requirements of standard European-style concealed hinges, eliminating the guesswork of adapting a general-purpose bit to a specialized task.
- The 70mm long-series length opens up boring capability in thicker cabinet door stiles and frame components where standard-length hinge boring bits would fall short - no extensions or special tooling required.
- The combination of a carbide (HW) head, negatively ground spurs, and PTFE-coated spiral addresses three common production problems at once - premature wear, edge tearout, and chip clogging - in a single tool.
- The parallel shank with driving flat and length adjusting screw gives operators repeatable depth control across every spindle position on a multi-spindle boring machine, supporting consistent quality in batch cabinet production.
Specifications
- Manufacturer Part Number: 369.140.11
- Brand: CMT Orange Tools
- Diameter: 14mm
- Total Length: 70mm
- Shank: 10 x 26mm
- Rotation: Right-Hand (RH)
- Number of Spurs: 2
- Number of Teeth: 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-style concealed hinges
- Cabinet door hinge cup boring in production and custom cabinetmaking
- Hinge installation in solid hardwood, softwood, chipboard, MDF, and plywood panels
- 32mm system cabinet component processing on multi-spindle boring machines and CNC boring centers
Frequently Asked Questions
What shank size does this hinge boring bit use, and what machines will accept it?
This bit uses a 10 x 26mm parallel shank with a driving flat and length adjusting screw. That shank profile is compatible with multi-spindle CNC boring machines, CNC boring centers, panel processing centers, boring machines with an appropriate adapter or chuck, drill presses, and handheld drills capable of accepting a 10mm parallel shank.
What is the difference between this 70mm long-series bit and a standard-length hinge boring bit?
The 70mm total length classifies this as a long-series hinge boring bit. The additional length provides the clearance needed to bore hinge cup holes in thicker cabinet door stiles and frame components that a shorter bit would not be able to reach. The bore diameter and flat-bottom geometry remain identical to standard-series hinge bits of the same 14mm diameter.
Why are the spurs on this bit negatively ground, and what does that mean for hole quality?
Negatively ground spurs are angled to score and sever wood fibers at the perimeter of the bore before the body of the bit removes material. This shearing action produces clean bore walls and a flat bottom with minimal tearout or splintering at the entry point - important for a proper hinge cup seat where a ragged edge could affect how the hinge cup seats and closes.
What is the purpose of the PTFE coating on the spiral flutes?
The orange or black PTFE coating applied to the spiral portion of the bit resists the adhesion of pitch, resin, and glue residue that accumulates during boring of glued panels, chipboard, and MDF. By preventing buildup on the flutes, the coating keeps chips evacuating freely, reduces friction-related heat, and extends the service life of the bit between cleanings and resharpening cycles.
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