LMT Onsrud 61-084 1/4in Carbide Straight Flute Chucking Reamer

The LMT Onsrud 61-084 is a new, solid carbide straight-flute chucking reamer with a 1/4 in (0.250 in) reaming diameter, manufactured in the USA as confirmed by the shank markings visible in the photos. The part number S288734 is the manufacturer's internal catalog/serial reference, and the Prop 65 label on the packaging confirms a cobalt-binder carbide substrate, consistent with LMT Onsrud's production-grade submicron carbide construction used for their 61-series reamers. Straight-flute geometry is suited for reaming short-chipping materials such as cast iron, brass, and bronze, as well as through-hole applications where chip evacuation is straightforward. The tool features a black oxide or steam-oxide surface treatment on the shank as visible in the photos, with a bright-ground flute and cutting edge. Compatible with standard 1/4 in straight-shank ER collet chucks, drill chucks, and precision toolholding systems on CNC machining centers, knee mills, and drill presses.

Product Specifications