Onsrud 63-718 Routing End Mill Up O-Flute 3/16 5/8 hand tool

Routing end mill for hard plastic

This Onsrud 63-718 is a solid carbide router bit with an upcut O-flute spiral. It is intended for machining hard plastic materials where chip evacuation and a clean finish are required. The cutter diameter is 3/16 inch.

Upcut O-flute geometry constraints

The upcut spiral pulls chips upward and out of the cut, which helps prevent re-cutting in plastic. This action can lift thin or poorly secured workpieces, so firm hold-down is necessary. The O-flute design reduces heat build-up but does not eliminate the need for appropriate feed rates.

3/16 inch cutter diameter decides fit

The 3/16 inch diameter determines the minimum internal radius and the width of the slot this tool can produce. If a narrower cut or smaller radius is needed, this bit cannot achieve it. Select a different diameter when the design calls for finer detail.