Product Description
CMT Hinge Boring Bit 15 x 70mm Left-Hand Rotation is a long-series carbide-tipped boring bit engineered for drilling precise flat-bottom hinge cup holes in cabinet components. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this left-hand rotation bit is the correct tool for European-style concealed hinge installation on multi-spindle CNC boring machines and compatible boring equipment. The PTFE-coated spiral flutes resist pitch and glue buildup during repeated production runs, keeping the bit cutting cleanly through chipboard, MDF, plywood, hardwood, and softwood.
Key Features
- Carbide (HW) Cutting Head on Super-Strength Steel Body - tungsten carbide delivers lasting edge retention when boring hinge cup holes in dense materials like MDF and chipboard, reducing the need for frequent bit changes in high-volume cabinet production.
- PTFE-Coated Spiral Flutes - the orange or black PTFE coating on the spiral portion prevents pitch and glue buildup, maintaining smooth chip evacuation and extending tool service life in adhesive-rich panel processing environments.
- 2 Precision-Ground Negatively Set Spurs (Z2) - negatively ground geometry produces clean bore walls and a flat-bottomed hole with minimal tear-out, which is critical for proper seating of European concealed hinges.
- Precision-Balanced Centre Point - the carbide centre point locates accurately and prevents walking at the start of the bore, ensuring repeatable hole placement across cabinet door panels.
- 2 Spiral Flutes - dual flutes clear waste material efficiently, reducing heat buildup and maintaining cut quality throughout extended production cycles.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10 x 26mm shank with driving flat locks securely in multi-spindle boring machine chucks, while the length adjusting screw allows precise depth setting without extra tooling.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle CNC boring machines and boring centers, ensuring the correct cutting geometry is engaged for clean results.
- 15mm Bore Diameter at 70mm Total Length - the long-series 70mm length provides the necessary reach for boring hinge cup holes in thicker cabinet door and panel components where standard-length bits fall short.
Why This Product
- The 70mm long-series length gives this bit the reach required for thicker cabinet components, making it the right choice when standard-length hinge boring bits cannot achieve the necessary hole depth for European concealed hinge installation.
- Left-hand rotation is a mandatory requirement for left-side spindles on multi-spindle CNC boring machines - using the wrong rotation direction causes the cutting edges to rub rather than cut, and this bit is purpose-built to match that spindle configuration.
- The combination of a negatively ground spur geometry and a precision-balanced carbide centre point means each hole is located accurately and exits with clean walls - reducing rework and fitting issues when hanging cabinet doors with concealed hinges.
- PTFE spiral coating directly addresses one of the most common issues in panel production - glue and pitch adhesion on boring bits - keeping the flutes clear and the cut quality consistent across long production runs without frequent cleaning stops.
Specifications
- Manufacturer Part Number: 369.150.12
- Brand: CMT Orange Tools
- Diameter: 15mm
- Total Length: 70mm
- Shank: 10 x 26mm
- Rotation: Left-Hand (LH)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth Geometry: Negatively ground spurs
- Material: HW (Tungsten Carbide) head on super-strength steel body
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes in cabinet door panels
- European concealed hinge installation
- Cabinet door hinge mounting in production and custom shop environments
- Boring hinge cup holes in solid hardwood, softwood, chipboard, MDF, and plywood
- Left-hand spindle positions on multi-spindle CNC boring machines and boring centers
- Panel processing on CNC boring centers and panel processing centers
- Use with boring machines fitted with an adapter or chuck, and drill presses accepting a 10mm parallel shank
Frequently Asked Questions
Why does this hinge boring bit rotate left-hand instead of the more common right-hand direction?
Multi-spindle CNC boring machines and boring centers position spindles on both the left and right sides of the machine head. Left-hand (LH) spindles rotate in the opposite direction from right-hand spindles, so the boring bit must be ground and oriented to match that rotation. Using a right-hand bit in a left-hand spindle causes the cutting edges to contact the material in reverse, producing a rough, torn hole rather than a clean flat-bottom bore. This bit is specifically designed for left-hand spindle positions to ensure correct cutting action.
What is the difference between a 70mm long-series hinge boring bit and a standard-length bit, and when do I need the longer version?
Standard hinge boring bits are shorter and suited to typical cabinet door panel thicknesses. The 70mm total length of this bit provides additional reach for boring hinge cup holes in thicker cabinet components where a shorter bit would not achieve the required depth. If your cabinet doors or panels are thicker than what a standard-length bit can reach, the long-series 70mm version is the appropriate choice.
What does the PTFE coating on the spiral flutes actually do during use?
The PTFE (polytetrafluoroethylene) coating applied to the spiral portion of the bit creates a low-friction surface that resists adhesion of pitch, resin, and wood glue. In production cabinet work where MDF, chipboard, and plywood are bored repeatedly, these materials can transfer adhesive residue onto the bit's flutes, restricting chip flow and generating heat. The PTFE coating keeps the flutes cleaner during use, supporting consistent chip evacuation and helping maintain cut quality over longer production runs without frequent manual cleaning.
What does the driving flat and length adjusting screw on the shank do?
The parallel shank features a flat machined along its side - the driving flat - which engages the set screw in the boring machine spindle or chuck. This flat prevents the bit from rotating or slipping within the holder under cutting load, which is particularly important during repeated high-volume boring cycles. The length adjusting screw allows the operator to set the bit's projection from the holder with precision, directly controlling the depth of the hinge cup hole without relying on separate depth-stop accessories.
Reviews
FAQs
Standard Shipping is free on most orders over $50 within the contiguous US. If the order is under $50.00, the shipping is $9.99 set fee for shipping within the contiguous US.
Most of our products will ship within 1 to 3 Business Days. Some Special order products will ship within 2 to 5 Business Days. Preorders will be shipped to you on a first come first serve basis as soon as available from the manufacturer. Items that are "Made-to-Order" (Custom order products) will be shipped when fabrication is completed, shipping and delivery times will vary and depend on manufacturing.
Products that are shipped directly from the manufacturer will have processing and fulfilment times subject to manufacturer availability.
Preorders are shipped on a first come first serve basis as soon as available from the manufacturer, the sooner you place your Preorder the sooner your order will ship.
Freight shipping Policy:
Orders/Items too large or heavy may require special handling/Shipping and may require to be sent by truck. Someone must be present to accept truck deliveries. Standard truck delivery is to a dock facility designed to receive freight. You will be notified within 24 hours of ordering to confirm delivery. Lift gates for deliveries are available for an additional fee.
We offer Financing options through Clicklease
Please email your Return request to info@FactoryDirectSupplyOnline.com
Include the order number and the reason for your return.
All returns, regardless of their categorization, must include all original parts, be in their original packaging, and in the condition in which they were received. You may not qualify to receive a refund If the returned item is used, damaged, missing any parts, or is damaged during return shipping.
Checkout our complete Return policy
You can contact us through our contact page! We will be happy to assist you.