Downcut Top-Edge Control
The downcut spiral directs cutting pressure toward the workpiece to help reduce upper-surface breakout in laminated and composite panels.


HW solid-carbide right-hand downcut spiral router bit designed for clean top-edge CNC routing in solid wood, wood composites, laminated materials, hardwoods, softwoods, composites, and selected plastics. Its 3/8-inch cutting diameter, 1-1/4-inch cutting edge, matching 3/8-inch shank, and 3-inch overall length support dados, grooves, pockets, profiles, and panel machining where visible-surface quality matters.
This production tool combines HW solid-carbide construction, two downcut spiral flutes, right-hand rotation, no coating, and a matching 3/8-inch shank for controlled routing where clean upper edges are a priority.
Designed for compatible CNC routers and routing equipment using a precision 3/8-inch collet or approved toolholding assembly with right-hand spindle rotation.
The Royce Ayr 2-Flute Downcut Spiral Router Bit R57-32225 is designed for clean top-edge cutting in cabinetmaking, millwork, fixture production, and panel-processing environments. Its downcut geometry directs cutting pressure toward the workpiece, helping support the upper surface and reduce top-side breakout during dados, grooves, pockets, profiles, and laminated-panel machining.
The 0.3750-inch cutting diameter and 1.250-inch cutting edge provide useful reach for common CNC routing operations. The matching 0.375-inch shank and 3.000-inch overall length suit compatible CNC router collets and toolholders while maintaining a practical format for controlled production use.
This uncoated HW solid-carbide tool uses two downcut spiral flutes and right-hand rotation. It is listed for solid wood, wood composites, laminated material, hardwoods, softwoods, composites, and selected plastics. Correct collet condition, minimum practical projection, verified runout, suitable RPM, feed rate, depth-per-pass, workholding, and dust or chip evacuation are essential for maintaining finish quality and reliable tool life.
Technical Specifications
The downcut spiral directs cutting pressure toward the workpiece to help reduce upper-surface breakout in laminated and composite panels.
The verified cutting-edge length supports controlled dados, grooves, pockets, profiles, and common production-routing operations.
HW construction, two flutes, right-hand rotation, no coating, and a matching 3/8-inch shank define the supplied configuration.
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. Verify the programmed cutting depth against the 1-1/4-inch cutting edge. Inspect and clean the collet, minimize unsupported projection, verify runout, and match spindle speed, feed rate, cut depth, workholding, guarding, and dust or chip evacuation to the selected material.
The Royce Ayr 2-Flute Downcut Spiral Router Bit R57-32225 provides an uncoated HW solid-carbide solution for clean routing in solid wood, wood composites, laminated materials, hardwoods, softwoods, composites, and selected plastics.
Its 3/8-inch cutting diameter, 1-1/4-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.