Product Description
CMT 392.350.11 Hinge Boring Bit - 35mm x 5/16" Parallel Shank by CMT is a precision carbide-tipped boring bit engineered for drilling clean, flat-bottom hinge cup holes for European concealed hinge installation. With a 35mm cutting diameter and a parallel (straight) 8mm shank, this right-hand rotation bit is compatible with router tables, drill presses, CNC boring centers, panel processing centers, and handheld drill machines - making it a versatile choice for cabinet makers and woodworking professionals who need consistent, accurate hinge mortises in solid wood, MDF, plywood, chipboard, and more.
Key Features
- Super-Strength Steel Body (HW Material): the bit is built on a precision-balanced, super-strength steel body - delivering durability and stability during high-repetition hinge cup boring operations, reducing vibration and extending service life.
- Precision-Balanced Centre Point: the HW precision-balanced centre point self-locates on the workpiece surface - ensuring accurate bit positioning with every plunge and eliminating costly layout errors during concealed hinge installation.
- 2 HW Precision-Ground Cutting Edges (Z2): two tungsten carbide precision-ground cutting edges power through solid hardwood, softwood, MDF, plywood, and chipboard - producing a smooth, flat-bottom hole that seats European concealed hinges correctly without secondary cleanup.
- 2 HW Negatively Ground Spurs (V2): two negatively ground carbide spurs score the perimeter of the bore cleanly before the cutters engage - preventing tearout and delivering crisp bore walls on face frames, door panels, and cabinet components.
- Parallel (Straight) Shank - 8mm: the 8mm parallel shank fits standard drill chucks, boring machine adapters, and handheld drill machines - providing broad machine compatibility without requiring specialized toolholders.
- Right-Hand (RH) Rotation: designed for standard right-hand rotation machines - ensuring correct cutting geometry and chip evacuation in the most common workshop and production drilling equipment.
- 35mm Cutting Diameter: the industry-standard 35mm bore size matches the cup diameter required by the vast majority of European concealed hinges - enabling direct, no-modification installation on cabinet doors.
- 60mm Total Length: the 60mm overall length provides sufficient clearance for use in drill press chucks, CNC boring centers, and panel processing centers without interference from machine heads or fences.
Why This Product
- Industry-Standard 35mm Bore for European Hinges: the 35mm cutting diameter is the universal cup size required by European concealed hinges used in virtually all modern cabinet door applications - choose this bit when you need a hole that fits without modification or shimming.
- Clean Bores in Multiple Sheet Goods and Solid Wood: with 2 negatively ground carbide spurs and 2 precision-ground carbide cutting edges working together, this bit handles solid hardwood, softwood, MDF, chipboard, and plywood cleanly - reducing sanding, patching, or rework time on finished cabinet faces.
- Flexible Machine Compatibility via Parallel Shank: the 8mm parallel shank fits into standard drill chucks found on drill presses, CNC boring centers, panel processing centers, and handheld drills - so this single bit works across production machinery and portable tools without adapter complications.
- HW Carbide Construction for Production Durability: tungsten carbide cutting edges and spurs maintain their edge longer than high-speed steel alternatives during repetitive hinge cup drilling - supporting higher throughput in cabinet shop production environments.
Specifications
- Manufacturer Part Number: 392.350.11
- Brand: CMT Orange Tools
- Diameter: 35mm (1 3/8")
- Total Length: 60mm
- Shank: 8mm (5/16") parallel
- Number of Spurs: 2
- Number of Cutting Edges: 2
- Blade Material: HW (Tungsten Carbide)
- Rotation: Right-Hand (RH)
- Shank Type: Parallel (Straight)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinges
- Cabinet door hinge mounting and layout
- Concealed hinge installation on face-frame and frameless cabinets
- Panel boring on multi-spindle CNC boring machines
- Hinge cup drilling on CNC boring centers and panel processing centers
- Drill press hinge boring with chuck or adapter
- Handheld drill hinge cup boring with parallel shank models
- Boring in solid hardwood, softwood, chipboard, MDF, and plywood
Frequently Asked Questions
What shank size does this hinge boring bit use, and what machines is it compatible with?
This bit uses an 8mm (5/16") parallel (straight) shank. It is compatible with multi-spindle CNC boring machines, CNC boring centers, panel processing centers, boring machines with an adapter or chuck, drill presses, and handheld drills - any machine that accepts a standard 8mm parallel shank in its chuck or collet.
What size hinge cup hole does this bit produce, and which hinge type does it fit?
This bit bores a 35mm (1 3/8") diameter flat-bottom hole. The 35mm cup size is the standard dimension required by European concealed hinges used in cabinet door applications. It is designed specifically to produce the flat-bottom recess that concealed hinge cups seat into correctly.
What materials can this hinge boring bit cut cleanly?
This bit is suited for use in solid hardwood, softwood, chipboard, MDF, and plywood. The 2 negatively ground HW carbide spurs score the perimeter before the 2 precision-ground HW carbide cutting edges remove material, helping produce clean bore walls and flat bottoms across these common cabinet and panel materials.
Is this bit designed for right-hand or left-hand rotation, and why does it matter?
This bit is designed for right-hand (RH) rotation - the standard direction of rotation on the vast majority of drill presses, CNC boring machines, and handheld drills. Using a bit with the correct rotation direction ensures the cutting edges and spurs engage the material properly, producing clean cuts and correct chip evacuation. Do not use this bit on machines configured for left-hand rotation.
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