Chicago-latrobe 47228 Jobber Drill Bit 1.25 Mm Hss

Product Description

The CHICAGO-LATROBE 47228 is a jobber length twist drill bit designed for general-purpose hole-making in metalworking and fabrication applications. It is manufactured from high speed steel with an oxide coating that provides basic corrosion resistance and lubricity during cutting. The bit has a 1.25 mm diameter (0.0492 inches), an overall length of 38 mm (approximately 1.496 inches), and a 118-degree standard drill point angle. The two-flute spiral design with a regular helix and web-thinned, tapered web geometry promotes chip evacuation and reduces thrust when drilling into ferrous materials. Machinists, tool-and-die workers, and maintenance technicians install this bit in standard drill presses, CNC machines, and hand drills.

This bit is suited for drilling cast iron and steel in light to medium-duty production and maintenance environments. The straight-cylindrical shank with a diameter of 0.0492 inches fits standard three-jaw drill chucks and collet holders without modification. The Series 150 designation indicates a general-purpose jobber-length product built to DIN 338 specification, making it a common choice for shops that standardize on metric tooling. The short flute length of 16 mm (approximately 0.630 inches) and the compact overall length keep the tool rigid at small diameters.

Key Features

• High speed steel construction with oxide coating for basic lubricity and corrosion resistance
• 118-degree standard point angle for general-purpose entry into cast iron and steel
• Web-thinned, tapered web reduces drilling thrust and improves point stability
• Two-flute regular spiral promotes efficient chip evacuation
• Straight-cylindrical shank fits standard chucks and collet systems
• Manufactured to DIN 338 specification for consistent dimensional accuracy

Compatibility

Designed as an OEM-style replacement or direct-use jobber drill bit for general-purpose metalworking applications involving cast iron and steel workpiece materials. Primary workpiece materials listed by the manufacturer are cast iron and steel.

Installation Notes

This bit is installed by machinists and maintenance technicians in any chuck or collet system that accommodates a straight shank of 0.0492 inches. Before changing tooling, power down and de-energize the machine spindle completely. Secure the shank firmly in the chuck to the full depth of chuck jaw engagement to minimize runout at this small diameter. At 1.25 mm, the bit is fragile under side load — use appropriate feed rates and avoid lateral force during drilling.