Chicago-latrobe 47230 Jobber Drill Bit 1.35 Mm Hss

Product Description

The CHICAGO-LATROBE 47230 is a jobber-length twist drill bit designed for general-purpose drilling in cast iron and steel. Manufactured from high speed steel with an oxide coating for improved wear resistance, this bit measures 1.35 mm in diameter (0.0531 inches) with an overall length of 40 mm (1.575 inches). The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve centering. A two-flute spiral design with a regular helix evacuates chips efficiently during through-hole and blind-hole operations. This bit is a staple in metal fabrication, maintenance, and toolroom applications where precise small-diameter drilling is required.

The 47230 is suited for drilling cast iron and steel workpieces in light industrial, manufacturing, and maintenance environments. The straight-cylindrical shank seats securely in standard keyless or keyed drill chucks across benchtop drill presses, CNC machines, and handheld power drills. At 1.35 mm diameter, it fits applications requiring fine, close-tolerance holes such as pilot drilling, tapping preparation, and precision assembly work. It conforms to DIN 338 standards, making it a recognized specification in both domestic and international tooling programs.

Key Features

• 1.35 mm diameter (0.0531 inches) with a diameter tolerance of -0.0005 to 0.0000 inches for consistent hole sizing
• 118-degree standard drill point angle for general-purpose metal drilling
• High speed steel construction with oxide coating for increased surface hardness and corrosion resistance
• Web-thinned, tapered web reduces thrust requirements and improves chip clearance
• Two-flute regular spiral design promotes efficient chip evacuation in cast iron and steel
• Conforms to DIN 338 specification for internationally recognized dimensional standards

Compatibility

Designed for drilling cast iron and steel workpieces. Compatible with standard keyless and keyed drill chucks that accept straight-cylindrical shanks at 0.0531-inch shank diameter. Suitable for use in drill presses, CNC equipment, and handheld power drills across general-purpose metal drilling applications.

Installation Notes

This bit is installed and serviced by machinists, tool-and-die technicians, maintenance mechanics, and general fabricators. Secure the straight-cylindrical shank fully in the chuck before operation and verify chuck runout is within acceptable tolerances for small-diameter work. At 1.35 mm, the bit is susceptible to breakage under side loading or excessive feed pressure — use consistent, controlled feed rates appropriate for the workpiece material. Always wear appropriate eye protection and follow applicable shop safety procedures when operating rotary cutting tools.