Product Description
CMT Hinge Boring Bit 26 x 70mm Left-Hand Rotation is a long-series, carbide-tipped boring bit engineered specifically for drilling clean, flat-bottom hinge cup holes in cabinet panels and door components. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this 26mm diameter bit is the correct tooling choice for European-style concealed hinge installation where precise pocket depth and a clean bore wall are essential. The left-hand (LH) rotation suits specific multi-spindle boring machines and CNC boring centers that require counter-clockwise tooling. PTFE coating on the spiral portion resists pitch and resin buildup, keeping the flutes clear during extended production runs.
Key Features
- Tungsten Carbide (HW) Cutting Head - delivers long-lasting edge retention on abrasive engineered panels such as chipboard, MDF, and plywood, reducing regrinding frequency in high-cycle cabinet production.
- PTFE-Coated Spiral Flutes - the orange or black P.T.F.E. coating on the spiral portion prevents pitch and glue buildup, maintaining chip evacuation efficiency and extending tool service life between cleanings.
- 2 Precision-Ground Cutting Edges (Z2) with Negatively Ground Spurs - negatively set spurs score the material perimeter before the cutters enter, producing clean bore walls and crisp, tear-free entry holes without surface chipping.
- Precision-Balanced Centre Point - the hardened carbide centre point locates accurately on the bore mark, preventing bit walk at start-up and ensuring hole placement stays within the tight tolerances demanded by European hinge hardware.
- 2 Spiral Flutes - paired flutes balance chip load across both cutting edges and evacuate waste efficiently, contributing to consistent flat-bottom hole geometry across the full 26mm bore diameter.
- Parallel Shank with Driving Flat and Length-Adjusting Screw - the 10 x 26mm parallel shank with a driving flat locks securely in multi-spindle chucks and boring machine collets, while the length-adjusting screw allows precise depth calibration without removing the bit from the machine.
- Left-Hand (LH) Rotation - purpose-built for left-hand spindle positions on multi-spindle CNC boring centers and panel processing equipment, ensuring the correct cutting direction and proper chip evacuation geometry for those stations.
- 70mm Total Length (Long-Series) - the extended body accommodates boring through thicker cabinet components where a standard-length bit would bottom out in the chuck before reaching full hinge cup depth.
Why This Product
- European concealed hinge installation demands a flat-bottom, precisely sized pocket - this bit's 26mm diameter, carbide cutting head, and negatively ground spurs produce the exact bore geometry required for proper hinge cup seating without secondary cleanup.
- The long 70mm body is the right choice when boring hinge cups in thicker door stiles or cabinet components where a standard-series bit cannot achieve the required penetration depth while remaining fully engaged in the machine spindle.
- Left-hand rotation is a machine-specific requirement, not an interchangeable preference - specifying this LH bit for the correct spindle position eliminates tool-direction errors that cause surface tear-out and hinge misalignment.
- PTFE spiral coating combined with a carbide cutting head addresses two of the most common production issues simultaneously - resin fouling of the flutes and premature edge wear - making this bit well-suited to continuous-run cabinet shop environments processing chipboard and MDF.
Specifications
- Manufacturer Part Number: 369.260.12
- Brand: CMT Orange Tools
- Diameter: 26mm
- Total Length: 70mm
- Shank: 10 x 26mm parallel with driving flat and length-adjusting screw
- Rotation: Left-Hand (LH)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth Geometry: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Spiral Coating: P.T.F.E. (orange or black)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European-style concealed hinge installation
- Cabinet door hinge pocket boring
- Panel processing of solid hardwood, softwood, chipboard, MDF, and plywood
- Left-hand spindle stations on multi-spindle CNC boring machines and panel processing centers
- Boring center and drill press hinge cup operations (with appropriate shank adapter or chuck)
Frequently Asked Questions
What is the difference between a left-hand (LH) and right-hand (RH) hinge boring bit, and how do I know which one to order?
Left-hand (LH) bits rotate counter-clockwise and are designed for specific spindle positions on multi-spindle boring machines and CNC boring centers where the spindle is driven in a counter-clockwise direction. Using an LH bit on an LH spindle ensures the cutting edges engage the material correctly and chip evacuation flows in the right direction. Installing an RH bit on an LH spindle - or vice versa - will cause the spurs to rub rather than cut, producing burn marks, rough bore walls, and rapid edge degradation. Always confirm your machine spindle rotation before selecting tooling.
Why is the 70mm length important, and when would I need this long-series bit instead of a shorter one?
The 70mm total length allows the bit to bore hinge cup holes in thicker cabinet door stiles and panel components where a shorter bit would bottom out inside the machine chuck or collet before the cutting head reached the required pocket depth. If the combined depth of the chuck engagement and the required bore depth exceeds the usable flute length of a standard-series bit, a long-series 70mm bit like this one is the correct specification. The length-adjusting screw on the parallel shank also makes it straightforward to set exact hinge cup depth without removing the bit.
What materials can this hinge boring bit cut effectively?
The tungsten carbide (HW) cutting head and negatively ground spurs on this bit make it suitable for solid hardwood, softwood, chipboard, MDF, and plywood - the primary materials used in cabinet door and panel construction. The PTFE coating on the spiral flutes is particularly beneficial when boring chipboard and MDF, where resin binders and adhesives can foul uncoated flutes and reduce chip evacuation efficiency over the course of a production run.
What does the P.T.F.E. coating on the spiral flutes actually do during use?
P.T.F.E. (polytetrafluoroethylene) is a low-friction, non-stick material applied to the spiral portion of the bit body. During boring operations - especially in resinous or adhesive-bonded sheet goods like chipboard and MDF - wood fibers, pitch, and glue residue tend to bond to uncoated tool surfaces, gradually packing the flutes and impeding chip evacuation. The PTFE coating reduces surface adhesion so that waste material releases more freely, maintaining consistent chip flow and reducing the frequency of mid-run cleaning stops. This directly supports longer production runs between tool maintenance intervals.
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