Drill America DWDCO1-5-16 1.31 in. Reduced Shank Cobalt Drill Bit

1-5/16 in. cobalt drill bit for heavy metalwork

This reduced-shank cobalt steel bit measures 1.31 inches in diameter with a 3-inch flute length and 6-inch overall length. The HD notched point design improves centering and reduces walking when starting holes in tough alloys. It suits machinists and fabricators who need a single large-diameter bit for drilling stainless steel, cast iron or high-strength steels. The 1/2-inch shank fits standard industrial drill presses and heavy-duty handheld drills.

Heat resistance and chip evacuation in deep cuts

Cobalt alloy retains hardness at elevated temperatures generated during prolonged drilling, reducing premature wear. Wide flutes evacuate chips efficiently across the 3-inch cutting depth, lowering friction and cutting forces. The silver-and-deming finish adds lubricity that helps manage heat buildup without external coolant in many applications. Users should still apply cutting fluid for maximum tool life in continuous production.