Yankee 02410322 1/2 in HSS LH Spiral Flute Chucking Reamer

This is a new Yankee (Vermont Tap & Die / Greenfield Industries) 1/2 in. HSS chucking reamer, part number 02410322 (catalog 435L, size 0.5000 in.), manufactured in the USA. The reamer features left-hand (LH) spiral flutes, which direct cutting forces axially to suppress chatter and produce superior surface finishes in through-holes, and is designed for machine use in a drill press, lathe, or machining center via a standard chuck or collet holder. Constructed from high-speed steel (HSS), the bright/uncoated finish (visible in photos) is suited for general-purpose reaming of steel, cast iron, aluminum, and non-ferrous materials where flood or mist coolant is applied. The "SS CHCK RMR" designation on the label confirms a straight shank chucking reamer form; the left-hand helix cuts on right-hand rotation and pulls chips forward rather than packing them into the hole, making this configuration preferred for blind-hole applications and materials prone to built-up edge.

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