Concave Half-Round Router Bit R4 – R60 mm | Convex Wood Profile – Prem

Concave Half-Round Cutter R4 – R60 mm | Convex Wood Profile – Premium HSS / T.C.T. Carbide

Professional bore cutter with a concave profile (curved inwards, in the shape of a groove), also known as a hollower or rounding cutter — used to create a convex profile (curved outwards) on wood: uniform and elegant roundings and half-round moldings. Available in a wide range of radii, from R4 to R60 mm, and in HSS M2 Premium and T.C.T. Carbide variants — select the material, radius, and bore from the menu.

Profile	ProfileConcave cutter (curved inwards, groove shape) – produces a convex, outward-curved profile on wood
Available Radius Range	Available Radius RangeR4 – R60 mm (selectable variants)
Active Working Space	Active Working Space2 × Selected Radius (e.g., R20 mm variant has 40 mm profile thickness)
Outer Diameter	Outer DiameterVaries depending on the chosen radius – according to the technical drawing of the variant
Bore (d)	Bore (d)Indicated for each variant: Ø30 mm or Ø32 mm \| Ø32/30 mm (with included reduction bush) \| other sizes by order
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 Teeth4 pcs.
Construction Type	Construction TypeBrazed with silver alloy (Ag), successively resharpenable; rebrazable in case of advanced wear
Recommended Speed	Recommended Speed6,000 or 9,000 RPM – the exact value is indicated on each cutter
Estimated Efficiency	Estimated EfficiencyUp to 3,000 linear meters (in softwoods, before the first resharpening)
Quantity / Package	Quantity / Package1 x Cutter (for more pieces, adjust the desired quantity at checkout)
Country of Origin	Country of OriginUkraine

🔧 MAIN FEATURES:

Efficient Machining: the concave profile of the cutter produces a uniform and aesthetic convex result on wood, across the entire R4–R60 mm radius range.
Durable Blades: 4 brazed teeth made of HSS M2 or T.C.T. Carbide, resistant to intensive use.
T.C.T. Carbide for Composites: metallic carbide inserts resist the abrasive wear of synthetic binders in MDF, chipboard, and HDF, where HSS would wear prematurely.
High Precision: ideal for fine details and decorative work.
Versatility: suitable for furniture, frames, panels, or hobby projects.
Long-Term Investment: inserts can be successively resharpened at a specialized center (to maintain the attack angle), and in case of advanced wear, the cutter body can be re-brazed with new inserts.
Black Oxide Finish: the cutter steel is treated with black oxidation (bluing), a treatment that gives it its characteristic black color and additional protection against corrosion.
Compatible with Classic Table Routers and 4-Sided Machines: mounts on both classic table routers with spindles and 4-sided machines, for flexible integration into the workshop's production flow.
Custom Radius on Request: if your project requires a specific radius outside the standard range, you can contact us with the technical drawing of your project.

⚠️ USAGE LIMITATIONS:

HSS M2 variant: ❌ NOT recommended for use on chipboard, MDF, HDF, or very hard exotic wood. For these materials, select the T.C.T. Carbide variant.
Carbide variant on soft wood: requires constant feed – stopping in rotation on resinous woods can cause local burns.

🛠️ 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)
Soft Wood (Spruce, Fir, Pine)	⭐ 100% (Impeccable Finish)	❌ Risk of burning (High friction)
Hard Wood (Beech, Oak, Ash)	80% (Efficient)	⭐ 100% (Maximum Resistance)
MDF / Chipboard / HDF / Laminated	Not Recommended	⭐ 100% (Optimal)
Number of Resharpenings	Maximum (M2)	Limited (3 mm)
Blade Material Hardness	64 – 66 HRC	85 – 92 HRC

✅ Purchase Conclusions:

HSS M2 – for solid wood: ideal for soft and hard species, a blade that sharpens more finely, leaving the convex profile perfectly smooth directly from the machine.
T.C.T. Carbide – for composites and intensive production: mandatory for MDF, chipboard, HDF, or abrasive exotic/composite woods, where it lasts much longer than HSS without resharpening.
Simple Configuration: choose the Material (HSS/Carbide), Radius (R4–R60) suitable for your project, and Spindle Bore according to the flange of the machine used in the workshop.

🦺 SAFETY MEASURES DURING USE:

Mandatory protective equipment: safety glasses (against projected chips), mask or respirator filter (fine wood dust), and earmuffs for prolonged work.
Attention to hands and fingers: maintain a safe distance from the cutting area and use feed/push devices where possible; do not manually intervene near the moving cutter.
Check the fastening of the cutter and spacer rings on the spindle before starting the machine.
Respect the recommended speed indicated for each cutter, to avoid vibrations or the risk of blade breakage.