Whiteside RU4900 Up-Cut Solid Carbide Spiral Router Bit – 3/8 Dia, 1-1/4 Cut Length

Overview

The Whiteside RU4900 is a sturdy solid carbide, up-cut spiral router bit designed for precise, controlled cuts across a range of materials. With a 3/8-inch cutting diameter and a 1-1/4-inch cutting length, it balances reach and stability while a 1/2-inch shank fits common routers for reliable performance.

The up-cut spiral design facilitates efficient chip removal and helps produce a clean edge on the side farthest from the router. The spiral helix supports crisp, consistent cuts even in deeper pockets or denser stock, reducing tear-out and helping you maintain material integrity as you work.

Key benefits

• Up-cut spiral for effective chip evacuation and clean-edge definition on the far face.
• Spiral helix delivers crisp cuts and steady performance across a variety of materials.
• Plunge-capable, multi‑purpose tooling suitable for grooves, dados, slots, pockets, and more.
• 4 compatibility with routers that accept a 1/2-inch collet, providing solid stability and control.

Materials and applications

• Best with hardwoods, softwoods, plywood, MDF, and hard plastics for versatile workshop use.
• Ideal for dado joints, grooves, slots, and precise pockets in cabinetry, shelving, and decorative work.

Usage tips

For max edge quality and tool life, use steady feeds and gradual depth steps. The 3-inch overall length offers suitable reach within standard router setups while maintaining balance.

Specifications

• Cutting diameter: 3/8" (0.375")
• Shank: 1/2"
• Cutting length: 1-1/4"
• Overall length: 3"
• Material: Solid carbide
• Recommended collet: 1/2"