Product Description
The CMT 369.180.12 Hinge Boring Bit - 18 x 70mm Left-Hand is a professional-grade carbide-tipped bit engineered for drilling precise flat-bottom hinge cup holes required by European-style concealed hinge systems. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this long-series 70mm bit reaches deeper into thicker cabinet door stiles and frame components where standard-length boring bits fall short. The left-hand rotation, orange or black P.T.F.E.-coated spiral flutes, and precision-balanced centre point work together to produce clean, consistent bores in solid hardwood, softwood, chipboard, MDF, and plywood without burning or tear-out.
Key Features
- HW (Tungsten Carbide) Cutting Head: Hardmetal carbide tip bonded to a super-strength steel body - delivers long-lasting edge retention in demanding production environments where repeated boring cycles would dull standard high-speed steel bits quickly.
- P.T.F.E.-Coated Spiral Flutes: Orange or black polytetrafluoroethylene coating on the spiral portion resists pitch and glue buildup - keeps the bit cutting freely and reduces friction heat, extending tool life between sharpenings.
- Negatively Ground Spurs (2 Spurs): Two precision-ground negatively set spurs slice the perimeter of the bore cleanly before the carbide head removes material - producing smooth, chip-free hole walls and a flat bottom that seats European concealed hinges flush.
- Precision-Balanced Centre Point: The self-centering tip registers accurately on layout marks - eliminates walking or drift at bore entry, which is critical when locating hinge cup holes to tight positional tolerances on cabinet doors.
- Two Precision-Ground Cutting Edges (Z2): Dual flute geometry balances chip evacuation on both sides of the bit - reduces vibration, promotes straighter bores, and delivers a flat-bottom finish suitable for hinge cup seating.
- Left-Hand (LH) Rotation: Purpose-designed for left-hand spindle boring machines and multi-spindle CNC configurations - ensures correct cutting action and chip ejection direction for LH machine setups.
- Parallel Shank with Driving Flat and Length Adjusting Screw (10 x 26mm): The flat-sided shank locks securely against drive-flat chucks and prevents slippage under torque - the length adjusting screw allows fine-tuning of boring depth without removing the bit from the machine.
- Long-Series 70mm Total Length: The extended body reaches deeper into thicker cabinet components than short-series alternatives - making it the correct choice for drilling hinge cups in solid-wood face-frame doors, thick stile stock, and panel processing applications.
Why This Product
- When European concealed hinge installation requires precise flat-bottom holes in thicker cabinet door stock, the 70mm total length provides the reach that short-series hinge boring bits cannot, without sacrificing the rigidity needed for a straight, on-axis bore.
- The P.T.F.E. spiral coating and negatively ground spurs address two of the most common production boring problems - resin buildup and torn hole perimeters - making this bit well suited to high-cycle cabinet shops working with chipboard, MDF, and hardwood.
- Left-hand rotation is not a universal specification - this bit is correctly engineered for LH spindle machines. Choosing a purpose-built LH bit rather than adapting a right-hand tool preserves cutting edge geometry and produces the correct chip-ejection behavior.
- The 10 x 26mm parallel shank with driving flat and length adjusting screw provides positive drive engagement and on-machine depth adjustment - reducing setup time between runs and minimizing the risk of shank slippage under repeated boring loads.
Specifications
- Manufacturer Part Number: 369.180.12
- Brand: CMT Orange Tools
- Diameter: 18mm
- Total Length: 70mm
- Shank: 10 x 26mm
- Rotation: Left-Hand (LH)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth Geometry: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinge systems
- Cabinet door hinge cup boring in face-frame and frameless construction
- European concealed hinge installation in solid hardwood and softwood doors
- Hinge boring in chipboard, MDF, and plywood panel components
- Multi-spindle CNC boring machine operations (left-hand spindle)
- CNC boring center and panel processing center operations
- Drill press and handheld drill applications using a compatible parallel shank adapter or chuck
Frequently Asked Questions
Why does this bit use left-hand (LH) rotation, and how do I know if my machine is compatible?
Left-hand rotation means the bit cuts when the spindle turns counter-clockwise. This is a specific requirement of certain multi-spindle boring machines and CNC boring centers that use LH spindle positions. Check your machine's spindle rotation direction before installing - using a left-hand bit in a right-hand spindle will not cut correctly and can damage both the bit and the workpiece.
What does the P.T.F.E. coating on the spiral actually do during boring?
The polytetrafluoroethylene coating applied to the spiral flute portion reduces friction between the bit body and the bore wall as chips are evacuated. This lower friction surface helps prevent pitch and glue resin from adhering to the flutes during repeated boring cycles, which would otherwise slow chip clearance, increase heat, and accelerate edge wear.
Why is a 70mm-length hinge boring bit needed instead of a shorter one?
The 70mm total length is a long-series specification intended for boring hinge cups in thicker cabinet components - such as solid hardwood door stiles or double-thickness panel stock - where a standard short-series bit would not reach the required depth or would not provide adequate shank engagement in the chuck. The extra length allows the bit to drill to the full hinge cup depth while keeping the shank seated securely in the spindle.
What does the length adjusting screw on the shank do?
The length adjusting screw is a set screw built into the parallel shank that allows the operator to fine-tune how far the bit protrudes from the chuck or boring head. This lets you dial in the correct boring depth on the machine without repositioning the stop collar or reconfiguring the spindle, which is useful when switching between hinge types that require slightly different cup depths.
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