Concave Quarter Round Milling Cutter with Bottom Radius R3 – R60 mm | HSS Premium / T.C.T. Vidia

SKU:9R3L-d32

119,00 RON

~~132,00 RON~~ 119,00 RON

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Concave Quarter Round Router Bit with Bottom Radius – Premium HSS | Under-Wood Processing

Professional bore router bit for rounding wood edges with a concave quarter-round profile, Bottom Radius configuration (processing under the workpiece) — specific positioning for working on a router table with a fence, where the workpiece slides over the tool. Available in a wide range of radii, from R3 to R60 mm, covering everything from fine decorative roundings to large profiles for posts, rustic furniture, or beams. Available in HSS M2 Premium and T.C.T. Carbide variants — select material, radius, and bore from the menu.

Profile	ProfileConcave quarter round (for achieving perfectly rounded convex profiles)
Processing Type / Position	Processing Type / PositionBottom Radius (processing under the workpiece)
Available Radius Range	Available Radius RangeR3 – R60 mm (selectable variants)
Outer Diameter / Total Thickness	Outer Diameter / Total ThicknessEach radius has a dedicated technical drawing with exact dimensions, available in the variant's image gallery
Bore (d)	Bore (d)Available on order, in standardized variants for stationary / CNC machines
Blade Material	Blade MaterialHSS M2 Premium (6.5% Tungsten), 64–66 HRC \| T.C.T. Carbide (metallic carbide), 85–92 HRC – select variant
Number of Teeth	Number of TeethZ4 (4 active brazed inserts)
Construction Type	Construction TypeBrazed with silver alloy (Ag), successively resharpenable; re-brazable when advanced wear occurs
Recommended Speed	Recommended Speed6,000 – 9,000 RPM (check marking on packaging or router bit body)
Estimated Yield	Estimated YieldUp to 3,000 linear meters (in soft wood, between resharpening cycles)
Professional Range	Professional RangeSolGrat HSS Premium
Country of Origin	Country of OriginUkraine

🚀 DYNAMIC PROPERTIES AND PERFORMANCE:

Optimal Configuration for Bottom Radius: specially designed for attacking and processing workpieces from underneath — specific positioning for working on a router table with a fence, where the workpiece is guided over the fixed tool.
Complete Range of Profiles (R3–R60): total flexibility in production, from fine decorative R3 roundings to large and massive R60 profiles, used for posts, rustic furniture elements, or beams. Complete geometric details can be found in the technical drawing for each piece.
Balanced HSS M2 Alloy (6.5% Tungsten): the sharp edge cuts the soft fibers of natural wood (spruce, fir, pine) cleanly, without tearing them and eliminating the risk of burn marks on the finished profile.
T.C.T. Carbide for Composites: metallic carbide inserts resist the abrasive wear of synthetic binders in MDF, particle board, and HDF, where HSS would wear prematurely.
Anti-Shock Structural System: profiled inserts are industrially brazed with silver alloy (Ag), which acts as a kinematic shock absorber, dispersing vibrations during cutting and protecting the machine's bearings.
Guarantee of Repeated Resharpening: the constant geometry of the concave profile allows for multiple resharpenings directly on the chip-breaker face of the insert, without deforming the tool's radius.
Custom Radius on Request: if your project requires a specific radius, outside the standard R3–R60 range, you can contact us with the technical drawing of your project.

📊 COMPATIBILITY RATING BY MATERIAL TYPE (HSS M2)

Softwood (Spruce, Fir, Pine, Lime) 100%

Excellent: clean cut, no burns, uniform finish.

Hardwood (Beech, Oak, Ash) 75%

Good: solid results, but blade wear is faster than on softwoods.

Particle Board / MDF / HDF / Laminate Not Recommended

The synthetic binder in these materials prematurely wears out the HSS blade.

💡 For constant processing of hardwoods or particle/MDF/HDF panels, the equivalent variant with T.C.T. Carbide inserts is also available, which is much more resistant to the abrasive wear of these materials.

⚠️ USAGE LIMITATIONS:

HSS M2 Variant: ❌ NOT recommended for use on particle board, MDF, HDF, or panels with synthetic adhesives! For these materials, choose the T.C.T. Carbide variant.
Carbide Variant on Softwood: requires constant feed rate – stationary rotation on resinous woods can cause local burns.
Resharpening: we recommend having it done at a specialized center to maintain the original cutting angle – incorrect resharpening can reduce cutting efficiency.

🛠️ Selection Guide: HSS M2 vs. T.C.T. Carbide

Choosing the correct blade material directly influences the finish quality and tool lifespan:

Material Processed	HSS M2 Premium ⭐ (6.5% Tungsten)	T.C.T. Carbide ⭐ (Metallic Carbides)
Softwood (Spruce, Fir, Pine)	⭐ 100% (Impeccable Finish)	❌ Risk of burning (High friction)
Hardwood (Beech, Oak, Ash)	80% (Efficient)	⭐ 100% (Maximum Resistance)
MDF / Particle Board / HDF / Laminate	Not Recommended	⭐ 100% (Optimal)
Composite & Exotic Materials	Forbidden	⭐ 100% (Maximum)
Number of Resharpenings	Maximum (M2)	Limited (3 mm)
Blade Material Hardness	64 – 66 HRC	85 – 92 HRC

✅ Conclusions for purchase:

HSS M2 – for solid wood: ideal for soft and hardwoods, a blade that sharpens finer, leaving the quarter round perfectly smooth directly from the machine, without the risk of micro-burns that Carbide can leave due to thermal friction on softwood.
T.C.T. Carbide – for composites and intensive production: mandatory for MDF, particle board, HDF, or abrasive exotic/composite woods, where it lasts much longer than HSS without resharpening.
Check Geometric Dimensions: each selected radius has its own technical drawing in the image gallery. Analyze the total diameter (D) and shaft dimension before placing your order.
Simple Configuration: choose the Material (HSS/Carbide), the appropriate Radius (R3–R60) for your project, and the Shaft Bore according to the flange of the machine used in your workshop.