Onsrud 57-240 solid router bit hand tool

Solid router bit for wood and MDF

The Onsrud 57-240 is a carbide solid router bit designed for primary material application on MDF and wood. Its spiral downcut geometry pushes chips downward to reduce tear-out on the top surface. This hand tool suits CNC operators and woodworkers who need clean edges in sheet goods. Buyers who want more storage or a different cutting profile will need another product.

Spiral downcut practical limits

The downcut action holds the workpiece firmly against the table during routing, which helps with thin or flexible stock. Chip evacuation occurs downward, so deep slots or blind pockets can pack with dust unless cleared by vacuum or air blast. The cutter diameter of 1/8 in limits the minimum internal corner radius that can be produced. Users needing upward chip flow or larger diameters must select a different tool.

Carbide construction and shank implications

Carbide material provides high wear resistance and retains sharpness longer than high-speed steel in abrasive composites such as MDF. The solid one-piece design eliminates braze joints that can fail under heavy feed rates. A 1/2 in shank fits standard collets and reduces deflection compared with smaller shanks. The tool ships without coatings, so lubrication or feed adjustments may be required for extended runs.