Onsrud 40-111 Upcut Spiral Router Bit 1/4 Inch Hss

Product Description

The ONSRUD 40-111 is a double-edge upcut spiral router bit designed for clean material removal in routing and milling applications. Built from high speed steel (HSS), it features a 0.25-inch cutter diameter, a 1-inch length of cut, and a 3-inch overall length with a 2-inch shank length. The upcut flute geometry pulls chips up and away from the cut, reducing heat buildup and helping clear material efficiently. A 19 to 32 degree helix angle supports smooth chip evacuation on softer and medium-density materials. The uncoated finish is standard for general-purpose routing work where coating is not required by the application.

This bit is intended for use in block and plate aluminum as well as natural wood. It suits CNC routing tables, handheld routers, and router spindles where a 1/4-inch shank collet is available. The right-hand cutting direction is compatible with standard router spindle rotation. Typical users include CNC machine operators, woodworkers, fabricators, and production shops running aluminum plate or solid wood workpieces. The compact 0.25-inch diameter makes it well suited for narrow slots, detail passes, and profile cuts where a larger tool would not fit.

Key Features

• Upcut flute geometry evacuates chips away from the workpiece surface
• High speed steel construction suitable for aluminum and natural wood
• 19 to 32 degree helix angle supports smooth cutting action
• Double-edge design for balanced cutting load
• Uncoated finish for general-purpose routing without added coating cost
• Right-hand cutting direction matches standard router spindle rotation

Compatibility

Designed for use in routers and CNC spindles fitted with a 1/4-inch collet. Rated for block and plate aluminum and natural wood applications per manufacturer specification.

Installation Notes

Installation should be performed by a qualified CNC operator or machinist. Power down and lock out the router or spindle before inserting or removing the bit. Seat the shank fully into the collet to the recommended engagement depth and tighten the collet nut to the router or spindle manufacturer's specification. Verify spindle speed is appropriate for the material and cutter diameter before beginning the cut.