Whiteside RU2100 Spiral Upcut Router Bit — 1/4 inch Cutting Diameter, 1/4 inch Shank, 1 inch Cutting Length

Premium performance from Whiteside RU2100

Whiteside Machine Company brings over three decades of tooling expertise to the RU2100 Spiral Upcut Router Bit. Built with solid carbide, it features a 1/4 inch cutting diameter, a 1/4 inch shank, and a 1 inch cutting length, with a compact 2-1/2 inch overall length built for use in routers with a 1/4 inch collet. This blend of capability and durability makes it a versatile choice for versatile joinery and detail work.

Key benefits include a clean edge on the side of the material farthest from the router, thanks to the upcut spiral, and rapid chip removal that helps keep the cut surface crisp even in deeper passes. The upward cutting action helps evacuate chips as you cut, reducing heat buildup and helping you maintain control over the process.

What it does best

• TOOL SPECS: Solid carbide, upcut spiral with 1/4 inch cutting diameter, 1/4 inch shank, 1 inch cutting length, and 2-1/2 inch overall length for use in routers with a 1/4 inch collet.
• UP CUT SPIRAL: For smooth finishes and rapid chip removal. Up cut spirals create a clean edge on the side of the material that is farthest from the router.
• HELIX: The upward cutting action removes chips efficiently, especially in deep cuts. The spiral helix ensures clean, crisp cuts while outperforming standard straight bits.
• MULTI-PURPOSE TOOLING: Plunge-capable bit for precision woodworking. For creating grooves, dados, slots, pockets, and more.
• MATERIALS: Performs best with hardwoods, softwoods, plywood, MDF, and hard plastics for woodworking applications.

Real-world use cases

This bit excels in cabinetry joinery, shelf grooves, and decorative inlays where a crisp edge matters. Its plunge-friendly design supports controlled entry, while the upcut spiral aids in clean side edges and efficient chip evacuation as you work through varied timber.

Tips for best results

• Test on scrap stock to dial in depth and feed rate before starting your project.
• Maintain steady feeds and avoid deep single-pass cuts to preserve edge quality and tool life.

Product specs at a glance

Overall length: 2-1/2 inches; cutting length: 1 inch; shank: 1/4 inch; cutting diameter: 1/4 inch. Compatible with routers equipped with a 1/4 inch collet.