Chicago-latrobe 49011 Screw Machine Drill Bit 4.50mm Cobalt

Product Description

The CHICAGO-LATROBE 49011 is a screw machine length drill bit designed for high-productivity drilling in cast iron and steel. Built from M42 cobalt high-speed steel, it handles heat and wear better than standard HSS bits, making it a reliable choice for production environments and heavy-duty applications. The 135-degree split point self-centers on contact, reducing the need for a center punch and minimizing walking on hard surfaces. At 60.12 mm overall length with a 24.89 mm flute length, this stub-length geometry delivers added rigidity for controlled, accurate holes in tight setups or drill presses.

This bit is sized at 4.50 mm diameter (0.1772 inches) and follows DIN 1897 screw machine length specifications. It is suited for production drilling in steel fabrication, machine shops, and maintenance environments where shorter bit length reduces deflection and breakage. The straight cylindrical shank seats securely in standard drill chucks. A straw oxide finish provides mild corrosion resistance and indicates heat treatment. The regular spiral flute geometry promotes chip evacuation in through-hole and shallow-depth drilling operations on cast iron and steel workpieces.

Key Features

• M42 cobalt steel construction for heat resistance in heavy-duty and production drilling
• 135-degree split point for self-centering and reduced thrust on hard materials
• Screw machine (stub) length provides increased rigidity and reduced deflection
• Straw oxide finish adds corrosion resistance and indicates proper heat treatment
• Right-hand cutting, regular spiral flute for efficient chip removal
• Meets DIN 1897 specification for consistent dimensional accuracy

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for Series 559 applications. Fits standard drill chucks accepting a 4.50 mm straight cylindrical shank. Primary workpiece materials are cast iron and steel.

Installation Notes

Installation and use should be performed by a qualified machinist or tool-room technician familiar with drill press or CNC setup procedures. Secure the straight shank fully in the drill chuck before operation and verify runout is within acceptable tolerance. Always wear appropriate eye protection and follow shop safety protocols when drilling metal. Do not exceed the recommended drilling depth of 0.6202 inches for this bit length to avoid deflection or breakage.