Product Description
CMT 313.080.42 Dowel Drill for Through Hole - 5/16" x 27 x 57.5mm Left-Hand Rotation is a solid carbide through-hole boring bit engineered for high-speed boring units and CNC routers where clean, precise dowel holes are required. Built entirely from premium super micrograin carbide, this left-hand rotation drill delivers exceptionally clear bores with no rough edges - making it a dependable choice for furniture manufacturing, panel processing, and demanding production environments working with hardwood, MDF, particle board, and veneered materials.
Key Features
- Solid super micrograin carbide construction (HW material grade) - the entire bit is manufactured from one continuous piece of premium carbide, providing extra structural safety, superior resistance to heat and wear, and an almost unlimited number of resharpenings compared to carbide-tipped alternatives.
- Curved, negatively ground spurs at the tip - this unique geometry produces exceptionally clean bore walls with no rough edges or tearout, which is critical when drilling veneered panels, coated boards, and fine hardwood where surface quality matters.
- Centre point balanced design - ensures the drill enters material on-center and tracks true throughout the cut, reducing vibration and improving hole position accuracy on multi-spindle and CNC boring equipment.
- Plunge edge extending to the centre of the bit - reduces drilling resistance during entry, increasing production speed and reducing load on boring machine spindles during high-volume panel runs.
- 2 precision-ground cutting edges (Z2) with 2 spiral flutes - balanced chip evacuation keeps the bore clean during through-hole drilling and prevents chip packing that can cause deflection or surface damage.
- Cylindrical head larger than traditional tip designs - provides greater resistance to prolonged use and reduces the frequency of tool changes in production environments, lowering downtime.
- Left-hand (LH) rotation - designed for left-hand spindle positions on multi-spindle boring machines and CNC boring centers, ensuring correct chip ejection direction and clean hole entry from the correct face.
- 10x27mm parallel shank with driving flat - provides a secure, slip-free seating in boring machine chucks and adapters, maintaining consistent depth and angular registration across long production runs.
- Extreme sharpening rating - the solid carbide body can be resharpened to extreme precision, extending the usable life of the tool significantly and reducing total cost per hole over time.
Why This Product
- Built for through-hole dowel work in demanding materials - the tip geometry and carbide grade are specifically designed to handle hardwood, particle board, MDF, and veneered composites without blowout on exit, making this drill the right tool for furniture and cabinet panel production.
- Solid carbide means more resharpenings and longer service life - unlike carbide-tipped bits that are limited by the size of the brazed tip, this solid carbide construction allows the bit to be resharpened nearly indefinitely, lowering the long-term cost of tooling for high-volume shops.
- Sized and rotated correctly for LH spindle positions - the left-hand rotation and 5/16" diameter match common boring machine configurations used in cabinet and panel processing centers, reducing the need for adapters or workarounds.
- Designed for both high-speed boring units and CNC routers - the bit's geometry and shank design allow it to perform accurately across different machine types, giving shops flexibility when scheduling work across equipment.
Specifications
- Manufacturer Part Number: 313.080.42
- Brand: CMT Orange Tools
- Diameter: 5/16"
- Cutting Height: 27mm
- Total Length: 57.5mm
- Shank: 10x27mm
- Number of Cutting Edges: 2
- Rotation: Left-Hand (LH)
- Material: HW (solid super micrograin carbide)
- Sharpening Rating: Extreme
Approved Applications
- Through-hole dowel drilling in solid hardwood and softwood
- Panel processing for furniture manufacturing
- Drilling through chipboard and particle board
- Boring through MDF and HDF panels
- Through-hole work in veneered wood and coated panels
- Production boring on multi-spindle CNC boring machines
- Through-hole operations on CNC boring centers and panel processing centers
Frequently Asked Questions
What is the difference between a through-hole dowel drill and a blind-hole dowel drill?
A through-hole dowel drill is designed to bore completely through a workpiece, with a tip geometry that prevents blowout and rough edges on the exit face. This CMT bit uses curved, negatively ground spurs to produce a clean bore on both entry and exit, which is essential for through-dowel joinery and panel-to-panel connections in furniture production.
Why does this drill have left-hand (LH) rotation, and how do I know if my machine needs it?
Left-hand rotation bits are used in left-hand spindle positions on multi-spindle boring machines and CNC boring centers. These machines often have paired spindle groups where some spindles rotate clockwise and others counter-clockwise. Check your machine's spindle rotation specification for the position you intend to use - installing a left-hand bit on a right-hand spindle will produce incorrect results and can damage the tool or workpiece.
Can this solid carbide bit be resharpened, and what does the "Extreme" sharpening rating mean?
Yes. Because this bit is constructed entirely from solid super micrograin carbide rather than having a carbide tip bonded to a steel body, it can be resharpened an almost unlimited number of times. The "Extreme" sharpening rating indicates the bit supports the highest level of resharpening precision available in this product line, which is particularly valuable for high-volume shops that want to maximize tool life and reduce per-hole tooling costs.
What materials can this bit drill through effectively?
This through-hole dowel drill is designed to perform in hardwood, particle board, MDF, veneered wood, and other difficult composites. The solid carbide construction and negatively ground spur geometry allow it to handle abrasive engineered panels - such as MDF and chipboard - that wear down conventional high-speed steel bits much more quickly.
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