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Concave Shank Router Bit (Quarter Round) - R4 | Z2 – T.C.T. Carbide
Concave Shank Router Bit (Quarter Round) - R4 | Z2 – T.C.T. Carbide
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SKU:V1017.S6.R4
Regular price
78,00 RON
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78,00 RON
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Round Over Router Bit with Bearing – T.C.T. Carbide | R4 mm | D18 mm | Z2
Router bit with shank and T.C.T. (Carbide) guide bearing, with two active cutting edges (Z2), for rounding over edges with an R4 mm quarter-circle profile. The top-mounted bearing faithfully follows the contour of the material — no guide rails needed, directly on the edge of the workpiece, including curved shapes, round tables, or irregular countertops. Available with a shank of Ø6 mm or Ø8 mm — select from the menu.
| Profile Radius (R) | Profile Radius (R)R4 mm – perfectly calibrated quarter-circle |
| Cutting Diameter (D) | Cutting Diameter (D)18 mm |
| Working Depth (Lc) | Working Depth (Lc)8 mm |
| Total Length (L) | Total Length (L)49 mm |
| Shank Diameter (S) | Shank Diameter (S)Ø6 mm or Ø8 mm – select from menu |
| Number of Cutting Edges | Number of Cutting EdgesZ2 – two symmetrical cutting edges, perfect dynamic balance |
| Blade Material | Blade MaterialT.C.T. Carbide (high-density metallic carbide) |
| Guiding System | Guiding SystemInterchangeable precision bearing mounted at the tip |
| Machine Compatibility | Machine CompatibilityHandheld router or fixed router table with Ø6 mm or Ø8 mm collet |
✨ CONSTRUCTION ADVANTAGES:
- Guide Bearing – No Auxiliary Guides: the bearing faithfully follows the contour of the workpiece, including curved shapes, round tables, countertops, or arches — impossible to achieve with a standard parallel guide.
- T.C.T. Carbide – No Burning: carbide inserts ensure clean chip removal without tear-out and excellent resistance to abrasive wear on particleboard, MDF, plastic, and solid wood.
- Profile with or without Step: by adjusting the router bit depth 0.5–1 mm deeper than the board's surface, a small aesthetic step above the radius is achieved — a classic cornice look.
- Symmetrical Z2 – Minimum Vibrations: the two balanced cutting edges eliminate idle vibrations and protect the router's bearings.
- Interchangeable Bearing: can be replaced separately when worn, without changing the router bit.
📊 MATERIAL COMPATIBILITY
Soft Solid Wood (Spruce, Fir, Pine, Linden)
100%
Excellent: clean rounding, no tear-out, smooth edge ready for varnishing.
Particleboard / MDF / HDF / Plywood
100%
Excellent: carbide resists abrasive synthetic binders in wood-based panels.
Hard Solid Wood (Oak, Beech, Ash)
90%
Very good: we recommend two passes — one quick for the bulk of the material, one fine for a mirror finish.
Technical Plastics
85%
Good: lower speed recommended to avoid melting plastic.
🛠️ ADJUSTMENT AND OPERATION TIPS:
- Simple rounding vs. profile with step: for simple rounding, align the top edge of the cutting blade with the board's surface. For a decorative profile with a step, lower the router bit by 0.5–1 mm — achieving a classic cornice look.
- Two passes on hardwoods: for oak, beech, or ash, do not force a single slow pass (risk of scorching). The first quick pass removes the bulk of the material, the second fine pass provides a mirror finish.
- Bearing maintenance: after working on resinous wood (pine, fir) or MDF, clean the bearing of resin deposits with a degreasing spray and apply a drop of fine oil — ensure free rotation without friction marks on the edge.
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