CMT 30mm Hinge Boring Bit with Parallel Shank by CMT is a precision-engineered carbide-tipped boring bit designed for drilling flat-bottom hinge cup holes used in European concealed hinge installation. With a 30mm (1-3/16") cutting diameter and an 8mm parallel shank, this right-hand rotation bit is compatible with drill presses, handheld drill machines with a suitable chuck, and boring machines fitted with an adapter. Built from super-strength steel with tungsten carbide (HW) cutting geometry, it delivers clean, accurate bores in cabinet door and face-frame work - making it a dependable choice for cabinetmakers, woodworkers, and shop professionals who demand consistent results across hardwood, softwood, MDF, chipboard, and plywood.

Key Features

• Super-Strength Steel Body - provides a rigid, vibration-resistant platform that keeps the bit running true at the centerline, reducing tear-out and maintaining bore accuracy over repeated use.
• Precision-Balanced HW Centre Point - tungsten carbide centre point registers on the workpiece before the outer geometry engages, keeping the bit from wandering and ensuring every hinge cup hole is drilled exactly on layout.
• 2 HW Precision-Ground Cutting Edges (Z2) - dual carbide cutting edges shear material efficiently, producing a flat-bottomed bore that seats concealed hinges flush without hand-fitting or additional cleanup.
• 2 HW Negatively Ground Spurs (V2) - a pair of negatively ground carbide spurs score the perimeter of the hole before the main cutters engage, resulting in clean, chip-free bore walls and sharp, splinter-free entry lines on finished panel surfaces.
• 8mm Parallel (Straight) Shank - the consistent cylindrical shank diameter accepts standard drill press chucks and boring machine adapters without the need for specialty tooling, keeping setup fast and flexible.
• Right-Hand (RH) Rotation - engineered for standard right-hand spindle rotation, compatible with the vast majority of drill presses, CNC boring centers, and handheld drill machines found in professional cabinet shops.
• 30mm Cutting Diameter, 60mm Total Length - the 30mm diameter is the industry-standard size for European concealed hinge cups, while the 60mm overall length provides enough reach for typical cabinet door stock without excessive overhang.

Why This Product

• The 30mm diameter matches the standard cup size required by virtually all European concealed hinges, eliminating guesswork and ensuring hardware fits on the first bore - no trial cuts needed.
• Dual negatively ground carbide spurs combined with dual carbide cutting edges work together to produce a bore with a clean perimeter and a flat bottom, which is critical for concealed hinge cups to seat properly and operate without binding.
• The parallel (straight) shank design means this bit can be run in a drill press, handheld drill, or boring machine fitted with a chuck or adapter - one bit covers multiple machine setups in a busy shop environment.
• Tungsten carbide (HW) construction throughout the cutting geometry - centre point, cutting edges, and spurs - means the bit maintains its edge longer when boring abrasive materials such as chipboard and MDF, reducing downtime for tool changes.

Specifications

• Manufacturer Part Number: 392.300.11
• Brand: CMT Orange Tools
• Diameter: 30mm (1-3/16")
• Total Length: 60mm
• Shank: 8mm (5/16") Parallel
• Number of Cutting Edges: 2
• Number of Spurs: 2
• Rotation: Right-hand (RH)
• Blade Material: Tungsten Carbide (HW)
• Body Material: Super-Strength Steel
• Product Type: Hinge Boring Bit - Parallel Shank

Approved Applications

• Drilling flat-bottom hinge cup holes for European concealed hinges
• Cabinet door hinge mounting in face-frame and frameless cabinet construction
• Boring hinge cups in solid hardwood panels
• Boring hinge cups in softwood panels
• Boring hinge cups in MDF
• Boring hinge cups in chipboard and particleboard
• Boring hinge cups in plywood