Chicago-latrobe 49025 Screw Machine Drill Bit 13mm Cobalt

Product Description

The CHICAGO-LATROBE 49025 is a screw machine length drill bit designed for high-production drilling in cast iron and steel. Built from M42 cobalt high-speed steel with an oxide finish, it delivers heat and wear resistance where standard HSS bits fall short. The 135-degree split point reduces thrust and self-centers on entry, eliminating the need for a center punch in most applications. At 4.163 inches overall length, the stub-length body adds rigidity and minimizes deflection under aggressive feed rates. This bit is suited for machinists, maintenance techs, and fabricators running drill presses, CNC turret mills, or hand-held power drills in production environments.

The 49025 is a Series 559 heavy-duty bit optimized for drilling cast iron and steel in screw machine, turret lathe, and general production drilling setups. The straight cylindrical shank at 0.5118 inches (13 mm) fits standard drill chucks without an adapter. With a maximum drilling depth of 1.7913 inches and a flute-to-diameter ratio of 4xD, it handles through-hole and blind-hole work in thick stock where jobber-length bits introduce runout or chatter. It is a practical choice for shops and field techs dealing with hard ferrous materials on a regular basis.

Key Features

• M42 cobalt steel construction for high heat resistance in ferrous metal drilling
• 135-degree split point for reduced entry thrust and self-centering action
• Oxide coating provides lubricity and corrosion resistance during cutting
• Screw machine (stub) length body increases rigidity and reduces deflection
• Right-hand cut with regular spiral and 2-flute design for efficient chip evacuation
• Conforms to DIN 1897 specification for dimensional consistency

Compatibility

Designed for drilling cast iron and steel. Compatible with standard drill chucks accepting a 0.5118-inch (13 mm) straight cylindrical shank. Fits Series 559 screw machine length bit applications per DIN 1897.

Installation Notes

Install and remove only with the machine fully powered down and the chuck key removed. Secure the workpiece in a vise or fixture before drilling to prevent rotation or grab at breakthrough. Use cutting fluid or coolant when drilling steel to extend bit life, noting that this bit does not support coolant-through delivery. Periodically clear chips from flutes to prevent packing, especially in blind-hole applications.