Chicago-latrobe 47229 Jobber Drill Bit 1.3mm Hss Oxide

Product Description

The CHICAGO-LATROBE 47229 is a jobber length twist drill bit designed for general-purpose drilling in steel, cast iron, and similar ferrous materials. It measures 1.3 mm (0.0512 inches) in diameter with a 118-degree standard point angle and a spiral flute configuration that promotes efficient chip evacuation. The bit is manufactured from high speed steel with an oxide finish that provides moderate lubricity and surface protection during cutting. With an overall length of 38 mm (1.496 inches) and a straight cylindrical shank, it fits standard drill chucks used by machinists, maintenance technicians, and fabricators working with small-diameter hole applications.

This bit is suited for light-duty precision drilling in metalworking environments including job shops, maintenance and repair operations, and manufacturing settings. It carries a right-hand cut and a tapered, web-thinned construction that reduces thrust and improves center starting accuracy on ferrous workpieces. The Series 150 designation places it in a well-established general-purpose line conforming to DIN 338 standards. Typical applications include drilling pilot holes, clearance holes, and through holes in mild steel and cast iron components where a small-diameter precision hole is required.

Key Features

• 1.3 mm (0.0512 inch) diameter with diameter tolerance of -0.0005 to 0.0000 inches for consistent sizing
• 118-degree standard point angle for general-purpose entry into ferrous metals
• High speed steel construction provides heat resistance during drilling operations
• Oxide coating offers surface lubricity and basic corrosion resistance
• Web-thinned tapered web reduces drilling thrust and improves bit centering
• DIN 338 compliant construction ensures dimensional consistency across production runs

Compatibility

Designed as a general-purpose jobber length drill bit for use in ferrous materials including cast iron and steel, conforming to DIN 338 specification for straight-shank twist drills in the 0.0500 to 0.1000 inch diameter range.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill presses, CNC machines, or hand-held power drills fitted with a compatible chuck. Secure the straight cylindrical shank firmly in the chuck before operation and verify runout before drilling small-diameter holes. At this diameter, feed rate and spindle speed must be carefully controlled to avoid bit deflection or breakage. Do not apply excessive downward force; allow the flute geometry and cutting edge to advance the bit naturally through the workpiece.