Product Description
The CMT Hinge Boring Bit 40 x 57.5mm Left-Hand (LH) is a precision-engineered tungsten carbide-tipped boring tool designed for drilling flat-bottom hinge cup holes in cabinet doors and face frames. Built for European-style concealed hinge installation, this bit delivers clean, accurate bores every time - making it the right choice for cabinetmakers and woodworking shops running boring machines equipped with adaptors or chucks. The left-hand rotation geometry, combined with 2 precision-ground cutting edges and 2 negatively ground spurs, produces consistent, splinter-free results in a wide range of panel and solid wood materials.
Key Features
- Hardmetal (HW) Cutting Head with Precision Balanced Centre Point - the carbide-tipped construction maintains a sharp, accurate bore entry over extended use, reducing tool replacement frequency and keeping production quality consistent.
- 2 HW Precision-Ground Cutting Edges (Z2) - dual carbide cutting edges distribute cutting load evenly, resulting in a flat-bottomed bore geometry essential for proper seating of European concealed hinges.
- 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry scores the material perimeter before the cutters engage, producing clean bore walls and chip-free edges in hardwood, softwood, chipboard, MDF, and plywood.
- Super-Strength Steel Body with PTFE Coating - the cutter portion is coated with orange or black P.T.F.E., which prevents pitch and resin buildup, reduces friction during drilling, and extends tool life without additional cleaning downtime.
- Parallel Shank (10 x 26mm) with Driving Flat and Length Adjusting Screw - the driving flat ensures positive torque transfer without slipping in the chuck, while the length adjusting screw allows precise depth setting for consistent hinge cup depth across a full production run.
- Left-Hand (LH) Rotation - designed specifically for left-hand rotation spindles on multi-spindle boring machines and CNC boring centers, ensuring proper chip evacuation and cutting action without tool reversal.
Why This Product
- The 40mm diameter and 57.5mm total length match the exact geometry required for standard European concealed hinge cup installation - no adapter modifications or custom setups needed when used on boring machines equipped with adaptors or chucks.
- The PTFE-coated super-strength steel body resists pitch and resin adhesion, meaning less frequent cleaning stops during high-volume panel processing runs and longer intervals between tool changes.
- Negatively ground spurs produce a scored perimeter cut before material removal, which is especially valuable when boring laminated panels, MDF, and chipboard where tearout and chipping are common quality concerns.
- The parallel shank with driving flat and length adjusting screw gives operators precise, repeatable depth control - critical for consistent hinge cup depth across an entire cabinet door batch.
Specifications
- Manufacturer Part Number: 317.400.12
- Brand: CMT Orange Tools
- Diameter: 40mm
- Total Length: 57.5mm
- Shank: 10 x 26mm
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Sharpening: Negatively ground spurs
- Material: HW (Hardmetal / Tungsten Carbide)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European-style concealed hinge installation
- Cabinet door hinge boring
- Face frame hinge cup drilling
- Panel processing on boring machines equipped with adaptors or chucks
Frequently Asked Questions
What is the correct rotation direction for this bit, and why does it matter?
This bit is designed for left-hand (LH) rotation. Using it on a right-hand spindle will cause the cutting edges to rub rather than cut, producing poor bore quality and rapid tool wear. Always confirm your boring machine spindle rotates left-hand before installing this bit.
What shank does this hinge boring bit use, and how is it secured?
The bit uses a 10 x 26mm parallel shank with a driving flat and a length adjusting screw. The driving flat ensures positive torque engagement in the chuck or adaptor, and the length adjusting screw allows the operator to set and lock a precise boring depth for consistent hinge cup results across a production run.
Why are negatively ground spurs important for hinge cup boring?
Negatively ground spurs score the perimeter of the bore before the main cutters remove material. This controlled scoring action severs surface fibers cleanly, which is especially important in laminated panels, MDF, and chipboard where the outer face is prone to chipping or tearout during plunge drilling.
What types of boring machines are compatible with this bit?
This hinge boring bit is compatible with boring machines equipped with adaptors or chucks that accept a 10 x 26mm parallel shank. This includes multi-spindle CNC boring machines, CNC boring centers, and panel processing centers that operate with left-hand spindle rotation.
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