Concave Quarter Round Milling Cutter with Radius R3 – R60 mm | HSS M2 / HW (K40)

SKU: 9R3R-d32
Regular price €22,95 incl. VAT
Regular price -12% €25,95 Sale price €22,95 incl. VAT
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Material
Radius × Bore (d)
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Concave Quarter Round Cutter with Top Radius – HSS M2 | Wood Machining from Above

Professional bore-type cutter, for rounding wood edges with a concave quarter-round profile, Top Radius configuration (machining from above the workpiece) — a positioning that offers excellent visibility of the cutting line when working manually on classic spindle moulders. Available in a wide range of radii, from R3 to R60 mm, covering everything from fine decorative rounding to large profiles for posts, rustic furniture, or beams. Available in HSS M2 and HW (K40) variants — select material, radius, and bore from the menu.

Profile ProfileConcave Quarter Round (for creating perfectly rounded convex profiles)
Processing Type / Position Processing Type / PositionTop Radius (machining from above 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 upon order, in standardized variants for stationary / CNC machines
Cutting Edge Material Cutting Edge MaterialHSS M2 (6.5% Tungsten), 63–65 HRC | HW (K40) (metallic carbide), 85–92 HRC – select variant
Number of Teeth Number of TeethZ4 (4 active brazed inserts)
Construction Type Construction TypeBrazed, successively resharpenable; re-brazable when extensively worn
Recommended Speed Recommended Speed6,000 – 9,000 RPM (check the marking on the packaging or cutter body)
Estimated Yield Estimated YieldUp to 3,000 linear meters (in soft wood, between resharpening cycles)
Professional Range Professional RangeSolGrat HSS M2
Country of Origin Country of OriginUkraine

🚀 DYNAMIC PROPERTIES AND PERFORMANCE:

  • Optimal Top Radius Configuration: specifically designed for attacking and machining workpieces from above (right-hand operation) — a positioning that allows excellent visibility of the cutting line when working manually on classic spindle moulders.
  • Full Range of Profiles (R3–R60): total production flexibility, 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 of each piece.
  • Balanced HSS M2 Steel (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.
  • HW (K40) for Composites: carbide inserts resist the abrasive wear of synthetic binders in MDF, particleboard, and HDF, where HSS would wear prematurely.
  • Repeated Resharpening Guarantee: the constant geometry of the concave profile allows for multiple resharpenings directly on the 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 (Fir, Spruce, Pine, Linden) 100%
Excellent: clean cut, no burns, uniform finish.
Hardwood (Beech, Oak, Ash) 75%
Good: solid results, but cutting edge wear is faster than on softwoods.
Particleboard / MDF / HDF / Laminate Not Recommended
The synthetic binder in these materials prematurely wears out the HSS cutting edge.

💡 For constant processing of hardwoods or particleboard/MDF/HDF panels, an equivalent variant with HW (K40) inserts is also available, which is much more resistant to the abrasive wear of these materials.

⚠️ LIMITATIONS IN USE:

  • HSS M2 variant: ❌ NOT recommended for use on particleboard, MDF, HDF, or panels with synthetic adhesives! For these materials, choose the HW (K40) variant.
  • HW (K40) variant on soft wood: requires constant feed – stalling in rotation on resinous woods can cause localized burning.
  • Resharpening: we recommend having it done at a specialized center to maintain the original cutting angle of the edge – incorrect resharpening can reduce cutting efficiency.

🛠️ Selection Guide: HSS M2 vs. HW (K40)

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

Material Processed HSS M2 ⭐
(6.5% Tungsten)
HW (K40) ⭐
(Tungsten Carbide)
Softwood
(Fir, Spruce, Pine)
⭐ 100%
(Impeccable Finish)
❌ Risk of burning
(High friction)
Hardwood
(Beech, Oak, Ash)
80%
(Efficient)
⭐ 100%
(Maximum resistance)
MDF / Particleboard / HDF / Laminate Not Recommended ⭐ 100%
(Optimal)
Composite & Exotic Materials Forbidden ⭐ 100%
(Maximum)
Number of Resharpenings Maximum (M2) Limited (3 mm)
Cutting Edge Material Hardness 63 – 65 HRC 85 – 92 HRC

✅ Conclusions for purchase:

  1. HSS M2 – for solid wood: ideal for soft and hardwoods, a cutting edge that sharpens more finely, leaving a perfectly smooth quarter-round directly from the machine, without the risk of micro-burns that HW (K40) can leave due to thermal friction on soft wood.
  2. HW (K40) – for composites and intensive production: mandatory for MDF, particleboard, HDF, or abrasive exotic/composite materials, where it lasts much longer than HSS without resharpening.
  3. Check Geometric Dimensions: each selected radius has its own technical drawing in the image gallery. Analyze the total diameter (D) and bore dimension before placing your order.
  4. Simple Configuration: choose from the selector the Material (HSS M2/HW (K40)), the Radius (R3–R60) suitable for your project, and the Bore according to the flange of the machine used in your workshop.

Delivery in 24–48 working hours for in-stock products, by courier (Fan Courier, Sameday, Cargus, DPD, GLS).

Free delivery in Romania for orders over 600 lei. We also ship to the EU, Moldova and Ukraine – the cost is calculated at checkout. Details in our Shipping policy.

This product is covered by the legal guarantee of conformity of at least 2 years, under EU and Romanian law. If the product does not match its description or does not work as intended, you are entitled to free repair or replacement and, in some cases, a price reduction or refund.

See the EU notice on the legal guarantee · europa.eu/youreurope – guarantees

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Order several variants

Variant Quantity Price Total
Concave Quarter Round Milling Cutter with Radius R3 – R60 mm | HSS M2 / HW (K40)
HSS M2 / HSS M2 R3 - d32/30 9R3R-d32
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Concave Quarter Round Milling Cutter with Radius R3 – R60 mm | HSS M2 / HW (K40)
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Concave Quarter Round Milling Cutter with Radius R3 – R60 mm | HSS M2 / HW (K40)
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HSS M2 / HSS M2 R6 - d32/30 9R6R-d32
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Concave Quarter Round Milling Cutter with Radius R3 – R60 mm | HSS M2 / HW (K40)
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Concave Quarter Round Milling Cutter with Radius R3 – R60 mm | HSS M2 / HW (K40)
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Concave Quarter Round Milling Cutter with Radius R3 – R60 mm | HSS M2 / HW (K40)
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