Product Description
CMT Two Flute Dowel Drill - 5/16" x 44 x 77mm Right Hand by CMT is a precision-engineered boring tool built for clean, accurate blind hole drilling in furniture panels, cabinet components, and solid wood assemblies. With a 77mm overall length and 44mm cutting height, this long-series dowel drill reaches deeper into thick panels than standard-length bits, making it a reliable choice for heavy-duty multi-spindle boring machines and CNC boring centers. The hardmetal (HW) carbide cutting head, PTFE-coated steel body, and negatively ground spurs work together to produce flat-bottom holes with smooth walls - exactly what dowel joinery and panel construction demand.
Key Features
- HW (Hardmetal Carbide) Cutting Head with 2 Precision Ground Edges (Z2) - carbide construction resists wear during high-volume boring in chipboard, MDF, hardwood, and laminates, keeping the bit sharp through extended production runs.
- 2 Negatively Ground Spurs (V2) - the negatively sharpened spurs score the material cleanly at the outer edge of the bore before the flutes remove waste, preventing tearout and surface delamination on coated panels and veneered boards.
- PTFE Coating on the Cutter Portion - the orange or black PTFE non-stick coating reduces friction and prevents pitch, resin, and glue buildup on the spiral, meaning less cleaning time and longer tool life between reconditioning cycles.
- Super-Strength Steel Body - the high-strength steel shaft provides rigidity and vibration resistance during rapid-cycle boring, contributing to consistent hole diameter and depth across the full cutting length of 44mm.
- Precision Balanced Centre Point - the HW centre point self-centres on the workpiece at the start of the bore, eliminating wander and producing holes that align accurately for dowel insertion and panel assembly.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10x30mm shank seats securely in standard boring machine chucks and multi-spindle heads, with the driving flat preventing rotation slip and the adjusting screw allowing precise depth setting without trial cuts.
- Right-Hand Rotation (RH) - compatible with the vast majority of vertical and horizontal boring spindles, ensuring straightforward fitment in standard furniture production equipment without requiring special adapters.
Why This Product
- The 77mm long-series length gives this dowel drill the reach needed for deep blind holes in thick panels and solid wood workpieces where standard-length bits fall short - without sacrificing hole quality or bore straightness.
- The combination of a carbide (HW) head and negatively ground spurs makes this bit suitable across a wide range of engineered and solid wood materials - chipboard, MDF, hardwood, softwood, laminates, and coated panels - reducing the need to switch tools between material types on the production floor.
- The PTFE-coated body actively resists the pitch and adhesive buildup that causes overheating and premature dulling, making this drill a practical choice for high-cycle furniture and cabinet manufacturing environments where downtime for tool maintenance is costly.
- The parallel shank with driving flat and length adjusting screw simplifies setup in multi-spindle CNC boring machines and boring centers, allowing operators to dial in precise hole depth quickly and repeat that setting reliably across production batches.
Specifications
- Manufacturer Part Number: 362.080.11
- Brand: CMT Orange Tools
- Diameter: 5/16"
- Cutting Height: 44mm
- Total Length: 77mm
- Shank: 10x30mm
- Number of Flutes: 2
- Number of Spurs: 2
- Spur Sharpening: Negatively ground spurs
- Blade Material: HW (Hardmetal Carbide)
- Rotation: RH (Right Hand)
- Shank Style: Parallel shank with driving flat and length adjusting screw
Approved Applications
- Blind hole drilling for dowel joints and dowel connections
- Panel drilling in furniture manufacturing
- Cabinet making and case good production
- Drilling in chipboard and particleboard
- Drilling in MDF and HDF
- Drilling in solid hardwood and softwood
- Drilling in plywood and laminates
- Drilling in coated and veneered panels
- Drilling in plastics
- Use in multi-spindle CNC boring machines and boring centers
- Use in panel processing centers with adapter or chuck
Frequently Asked Questions
What shank size does this dowel drill use, and will it fit my boring machine?
This drill uses a 10x30mm parallel shank with a driving flat and a length adjusting screw. The driving flat locks the bit against rotational slip in the chuck or spindle collet, and the adjusting screw lets you set precise boring depth. This shank configuration is standard for multi-spindle CNC boring machines, CNC boring centers, and panel processing centers equipped with a compatible chuck or adapter.
What is the maximum depth this drill can bore in a single pass?
The cutting height - the usable boring length - is 44mm. This long-series geometry allows the drill to reach deeper into thick panels and solid wood workpieces than shorter dowel drills, making it suitable for deep blind holes in furniture panels and structural dowel connections where a standard-length bit would not provide enough cutting depth.
Why do the spurs on this drill have a negative grind, and what difference does it make at the workpiece?
Negatively ground spurs are angled so that they shear the surface fibers at the outer diameter of the bore before the main cutting edges lift and remove material. This shearing action severs the wood or laminate face cleanly rather than tearing it, resulting in smooth bore walls, a flat hole bottom, and no chipping or delamination at the entry point - a critical quality requirement when drilling coated panels, veneered boards, and laminates used in finished furniture.
What does the PTFE coating on the cutter portion do, and does it affect hole quality?
The orange or black PTFE non-stick coating applied to the spiral prevents pitch, resin, and glue from bonding to the bit body during cutting. By keeping the flutes clear, the coating maintains consistent chip evacuation throughout the bore, which reduces heat buildup and friction. The result is a longer service interval between sharpenings and more consistent hole quality over repeated production cycles - particularly when drilling adhesive-coated or resin-rich materials.
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