Product Description
The CMT Hinge Boring Bit 32 x 57.5mm Left-Hand (LH) is a precision-engineered boring bit designed for drilling flat-bottom hinge cup holes in cabinet doors and face frames. Built by CMT with a tungsten carbide (HW) cutting head and a super-strength steel body coated with P.T.F.E., this 32mm diameter bit delivers clean, accurate bores required for European-style concealed hinge installation. Its left-hand rotation, parallel shank with driving flat, and length adjusting screw make it a dependable choice for use on boring machines equipped with adaptors or chucks, including multi-spindle CNC boring centers and panel processing equipment.
Key Features
- HW (Tungsten Carbide) Cutting Head with Precision Balanced Centre Point - the carbide construction resists wear during repetitive hinge cup drilling, keeping the bit on-center and reducing wander for accurate hole placement every time.
- 2 HW Precision Ground Cutting Edges (Z2) - dual carbide-tipped cutting edges share the load evenly, producing consistently flat-bottomed bores that seat European concealed hinges flush and correctly.
- 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry scores the material ahead of the cutting edges, resulting in clean bore walls with minimal tear-out on chipboard, MDF, plywood, and solid wood.
- P.T.F.E. Coating on the Cutter Portion - the orange or black P.T.F.E. coating prevents pitch and glue buildup on the bit body, reducing friction and extending tool life across high-volume production runs.
- Super-Strength Steel Body - the robust steel construction handles the mechanical demands of industrial boring machines without deflection, supporting precise, repeatable hinge cup geometry.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10 x 26mm parallel shank seats securely in adaptors or chucks, while the driving flat and adjusting screw allow precise depth setting for consistent hinge cup depth across every door in a production run.
- Left-Hand (LH) Rotation - the left-hand rotation matches machine spindles configured for LH tooling, ensuring the bit cuts in the correct direction without slipping or backing out of the chuck.
- 32mm Diameter - this is the standard diameter required by the vast majority of European concealed hinges, making this bit a direct fit for standard hinge cup boring without modification.
Why This Product
- Designed specifically for the 32mm flat-bottom hole geometry that European concealed hinges require - it eliminates the guesswork of adapting general-purpose bits and delivers the correct bore profile the first time.
- The combination of a carbide (HW) head, negatively ground spurs, and P.T.F.E. coating addresses the three most common problems in hinge boring - premature wear, tear-out, and resin buildup - in a single tool.
- The parallel shank with driving flat and length adjusting screw makes depth calibration straightforward on boring machines with adaptors or chucks, supporting consistent, repeatable results across large cabinet production batches.
- With left-hand rotation specified by CMT for this model, the bit is purpose-built to match LH-configured machine spindles, reducing setup errors and ensuring the cutting edges engage material in the correct direction for optimal performance.
Specifications
- Manufacturer Part Number: 317.320.12
- Brand: CMT Orange Tools
- Diameter: 32mm
- Total Length: 57.5mm
- Shank: 10 x 26mm
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Spur Geometry: Negatively ground spurs
- Material: HW (Tungsten Carbide) head, super-strength steel body
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinge installation
- Cabinet door hinge cup boring
- Face frame hinge mounting preparation
- Use on boring machines equipped with adaptors or chucks
Frequently Asked Questions
What shank size does this hinge boring bit use?
This bit uses a 10 x 26mm parallel shank with a driving flat and a length adjusting screw. It is designed for use on boring machines equipped with adaptors or chucks that accept this shank configuration.
Why does this bit have left-hand (LH) rotation, and how do I know if my machine needs it?
The left-hand rotation designation means the bit is designed to spin counterclockwise when viewed from the shank end. Multi-spindle boring machines often configure specific spindle positions for LH tooling to match the direction the cutting edges need to engage the material. Check your machine's spindle rotation specification before selecting a boring bit to confirm LH tooling is required for your application.
What is the purpose of the negatively ground spurs on this bit?
The 2 negatively ground spurs (V2) score the material at the perimeter of the bore before the cutting edges remove the core material. This scribing action severs the surface fibers cleanly, reducing tear-out and producing smooth bore walls - a particularly important quality when boring chipboard, MDF, or veneer-faced panels where surface damage around the hinge cup is unacceptable.
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 acts as a non-stick surface that resists the buildup of pitch, glue, and resin that accumulates during high-volume boring operations. By keeping the bit body clean, the coating reduces friction, helps maintain cutting efficiency, and extends the working life of the bit between sharpenings or replacements.
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