R12.7 rounding end mill with guide bearing

Brief description

The R12.7 rounding cutter rounds off wood edges with a 12.7 mm radius – the largest radius in this series, for substantially rounded edges and a quarter round profile. The pilot ball bearing (Ø 12.7 mm) on the cutter head runs along the workpiece edge, guiding the cutter even on curved contours where a fence won't fit. This lets you round off straight edges as well as curved tabletops, handrails, or grip rails.

The router bit is double-edged and carbide-tipped (HW), right-hand rotation, with an outer diameter of 38 mm and a cutting length of 19 mm. Its shank fits in hand routers, bench routers, and the RUWI router table collet), as well as on CNC machines. It cuts softwood, hardwood, and laminated panels. If the ball bearing wears out, you can replace it—instead of replacing the entire router bit.

With a diameter of 38 mm, this router bit fits into the router table runs at a reduced speed—which is a must, not an option, at this diameter. You can find more router bits in the RUWI , and the matching tables in the RUWI .

Applications

• Round off edges with a 12.7 mm radius – the largest radius in the series, also suitable for a quarter round profile
• Rout shaped contours without a fence – the pilot bearing follows the edge
• Give a substantial radius to tabletops, handrails, grip rails, and stair treads
• Double-edged carbide end mill, right-hand rotation, outer diameter 38 mm, effective length 19 mm
• shank for hand-held routers, RUWI router table CNC machines—for large diameters in router table a reduced speed
• For softwood, hardwood, and coated panels.
• Replaceable guide bearing (Ø 12.7 mm).

Downloads

RUWI Product Catalog 2026 (PDF)

All the details

• Profile and cutting edges
- Rounding radius R12.7 mm
- Double-edged (Z2)
- right-hand rotation

• Dimensions and design
- Outer diameter: Ø 38 mm
- shank 8 mm, shank length 32 mm
- working length: 19 mm, overall length: 66 mm
- Weight: approx. 73 g

• guide ball bearing
- Ball bearing Ø 12.7 mm, replaceable

• Material
- Carbide (HW)

• Compatibility
- For softwood, hardwood, and coated panels
- Can be used on RUWI (S/M/L), hand-held and bench routers, as well as CNC machines