Onsrud 57-280 carbide downcut router bit hand tool

Material and Application

This solid carbide router bit is built for CNC and hand-held routing in MDF and wood. The downcut spiral forces chips downward, leaving a clean top edge on through-cuts and dados. It suits sign makers, cabinet shops and hobbyists who need tear-out-free surfaces on sheet goods.

Shank and Geometry

A 1/4 inch shank fits standard collets on compact routers and larger machines alike. The downcut helix pulls the workpiece toward the table, improving hold-down on thin stock without additional clamping. Carbide construction resists abrasion from glue lines and dense composites far longer than high-speed steel alternatives.

Cutting Behaviour

Downcut action reduces lifting and vibration on the upper face, so finish passes often require no sanding. Chip evacuation occurs through the bottom of the cut, so dust extraction must be directed there to prevent recutting. The tool runs cool in natural woods and MDF when feed rates match the spiral geometry.