Unibor MMS20 20mm x 25mm pneumatic accessory

Unibor MMS20 annular cutter

The Unibor MMS20 is an economical metric HSS annular cutter sized at 20 mm by 25 mm. It is designed for operators who need to cut softer metals and most mild steels in maintenance or fabrication work. The tool delivers a 1 inch depth of cut in a single pass. It suits workshops that value straightforward metric tooling for everyday drilling tasks.

Capacity and headroom

The cutter handles mild steel and softer alloys comfortably within its 1 inch cutting depth. It runs out when material hardness exceeds the range of standard high-speed steel or when deeper holes are required beyond the stated depth. Users working with hardened grades or thick plate will need a different cutter geometry or a carbide-tipped alternative. The 20 mm diameter provides a useful mid-range size for common bolt-hole patterns.

Metric HSS interface limits

The metric shank fits standard magnetic drill presses and compatible arbor systems without adapters. High-speed steel construction limits cutting speed and tool life compared with carbide when used in abrasive or high-temperature applications. The economical design prioritises cost per hole over maximum wear resistance in demanding production runs. Shank dimensions of 20 mm by 25 mm determine direct machine compatibility.