Royce Ayr 2-Flute Ultimax Downcut Spiral Router Bit 3/8 in (9.53 mm)
2-Flute Ultimax Downcut
Spiral Router Bit
Ultimax-coated solid-carbide downcut spiral router bit designed for clean routing in solid wood, wood composites, laminated materials, and selected plastics. Its 3/8-inch cutting diameter, 1-inch cutting edge, matching 3/8-inch shank, right-hand rotation, and 3-inch overall length support dados, grooves, profiles, panel routing, and production machining where top-edge finish matters.
Main Product Description
The Royce Ayr 2-Flute Ultimax Downcut Spiral Router Bit R57-32222UM is designed for clean routing in solid wood, wood composites, laminated materials, and selected plastics. Its downcut geometry directs cutting pressure toward the workpiece, helping support the top edge during dados, grooves, profiles, and general routing where entry-side finish is important.
The 0.3750-inch cutting diameter, 1.000-inch cutting edge, matching 0.375-inch shank, and 3.000-inch overall length provide a balanced 3/8-inch production format for compatible router and CNC router systems. The UM suffix identifies this SKU as the Ultimax-coated version of the R57-32222 size.
This HC solid-carbide tool uses two downcut spiral flutes, Ultimax coating, and right-hand rotation. Correct collet condition, minimum practical projection, verified runout, suitable RPM, feed rate, depth-per-pass, workholding, and chip or dust evacuation are essential for maintaining finish quality, heat control, dimensional accuracy, and reliable tool life.
Best Fit Applications
Product Highlights
Ultimax-Coated Version
The UM suffix identifies the Ultimax-coated version of the verified R57-32222 downcut spiral size.
Clean Top-Edge Downcut
The downcut spiral directs cutting pressure toward the workpiece to help support the entry-side edge during routing.
Verified 3/8-Inch Format
The matching diameter and shank, 1-inch cutting edge, RH rotation, and 3-inch overall length define a balanced production configuration.
Compatibility & Installation Notes
Confirm that the spindle, collet, and toolholder accept an exact 3/8-inch (9.53 mm) shank, support right-hand rotation, and provide adequate clearance for the 3-inch overall length and required projection. Inspect and clean the collet, minimize unsupported projection, verify runout, and match spindle speed, feed rate, cut depth, workholding, guarding, and chip or dust evacuation to the selected material. Because this is a downcut tool, confirm chip-flow and pass strategy before deeper grooves or plastic routing.
Improve Ultimax Downcut Performance
The Royce Ayr 2-Flute Ultimax Downcut Spiral Router Bit R57-32222UM provides an Ultimax-coated HC solid-carbide solution for clean routing in solid wood, wood composites, laminated materials, and selected plastics.
Its 3/8-inch cutting diameter, 1-inch cutting edge, matching shank, two-flute downcut geometry, right-hand rotation, and 3-inch overall length support controlled production machining when correctly held and operated.