R3 rounding cutter with guide bearing

Brief description

The R2 rounding bit is one of our smallest quarter-round bits. With its replaceable ball bearing and two carbide-tipped cutting edges, it ensures clean, smooth curves—whether you’re working on straight or curved edges. The 2 mm radius creates subtle curves for a comfortable grip.

The guide ball bearing (12.7 mm diameter) guides the router bit along the edge of the workpiece; if it wears out, you can replace it individually. The router bit fits RUWI bench routers and standard hand-held and bench routers with an 8-mm collet. We use it in our own workshop to round off edges evenly.

If you need larger radii, the RUWI milling tools offer rounding cutters ranging from R3 to R12.7.

Possible applications

• Round edges evenly—straight or curved; R2 for subtle curves
• Run along the edge using the thrust ball bearing (Ø 12.7 mm) without side guidance
• For softwood, hardwood, and laminated panels
• Two carbide cutting edges (Z2), clockwise rotation, 17 mm head diameter
• 8-mm shank for RUWI milling tables, hand-held and bench-top routers, and CNC machines

Downloads

RUWI Product Catalog 2026 (PDF)

All the details

• Profile and cutting edges
- R3 mm fillet radius
- Double-edged (Z2)
- Cutting material: carbide (HW)
- Right-hand cutting

• Dimensions
- Outer diameter Ø 19 mm
- Effective length 10 mm
- Shank Ø 8 mm, shank length 32 mm
- Total length 56 mm
- Weight approx. 31 g

• Guide bearing
- Ball bearing Ø 12.7 mm, replaceable – guides along the workpiece edge

• Insert
- For softwood, hardwood, and coated panels
- For RUWI router tables, hand-held and bench routers, as well as CNC machines