Mortise & Tenon Spiral Router Bit, 8mm Upcut Joinery Bit with Variable Helix for Smooth Plunging, Designed for Shaper Origin & Plunge Routers – USA Made US820835UV

Ultra-Shear Variable Helix Mortise & Tenon Router Bits are engineered for woodworkers who demand smooth plunging, chatter-free cuts, and precise joinery results. Designed specifically for mortise and tenon joinery, these spiral upcut bits outperform standard straight and single-helix cutters—especially in deep mortises and long tenons. The variable helix geometry begins with a shallow angle at the tip for controlled entry and increases toward the shank to evacuate chips efficiently, reducing vibration and improving surface finish. Ideal for use with Shaper Origin joinery machines, these bits also excel in plunge router and fence-guided setups. Clean entry points, satin-smooth sidewalls, and consistent dimensional accuracy make them a go-to cutter for furniture makers and serious woodworkers. Manufactured from solid micro-grain carbide and precision-ground in Strongsville, Ohio, Ultra-Shear Variable Helix Router Bits deliver long tool life and dependable American-made quality.

• SPECS – 8mm shank | 8mm cut diameter | 35mm cut length | 76mm overall length | Solid carbide spiral upcut mortise & tenon router bit | Variable helix geometry | USA made.
• DESIGNED FOR MORTISE & TENON JOINERY - Engineered for cutting clean, accurate mortises and long tenons. Ideal for furniture making, cabinet joinery, and precision woodworking where dimensional accuracy matters.
• SMOOTH PLUNGING WITH REDUCED CHATTER - The variable helix design starts shallow at the tip for controlled plunging and transitions to a steeper helix to evacuate chips efficiently—dramatically reducing vibration and chatter in deep cuts.
• OPTIMIZED FOR SHAPER ORIGIN - Perfect for use with Shaper Origin, or with any plunge router or fence setup. Maintains control and surface finish even in demanding joinery operations.
• AMERICAN-MADE QUALITY - Manufactured from solid micro-grain carbide and precision-ground in Strongsville, Ohio for long tool life, consistent performance, and reliable results.