Chicago-latrobe 47227 Jobber Drill Bit 1.2mm Hss 118 Degree

Product Description

The CHICAGO-LATROBE 47227 is a jobber-length drill bit engineered for general-purpose drilling in ferrous metals including cast iron and steel. Ground from high speed steel (HSS) with an oxide finish, the bit delivers reliable performance in production and maintenance drilling applications. The 118-degree standard point angle suits flat and round stock entry without requiring a pilot hole in most setups. At 1.2 mm in diameter (0.0472 inches decimal equivalent) with a 38 mm overall length, this is a small-diameter bit intended for precision hole work in tight tolerances, with a diameter tolerance held to -0.0005 to 0.0000 inches.

This bit is suited for metalworking trades, maintenance technicians, and machine shop environments where small-diameter holes are required in steel and cast iron workpieces. The 16 mm spiral flute length provides adequate chip evacuation for the short depths typical of jobber-length applications. The straight-cylindrical shank fits standard drill chucks without adapters, making it compatible with bench drill presses, hand drills, and CNC drilling setups that accept this shank diameter. It conforms to DIN 338, the international standard governing jobber-length twist drill geometry.

Key Features

• 1.2 mm diameter (0.0472 inches) with diameter tolerance of -0.0005 to 0.0000 inches for consistent hole sizing
• High speed steel construction with oxide coating for corrosion resistance and reduced friction
• 118-degree standard point angle with web-thinned, tapered web for improved penetration and chip flow
• Regular spiral, 2-flute design for efficient chip removal in steel and cast iron
• Straight-cylindrical shank (0.0472 inches) seats securely in standard drill chucks
• Manufactured to DIN 338 specification for consistent geometry and interchangeability

Compatibility

Designed as a general-purpose jobber-length drill bit for use in cast iron and steel. Compatible with any standard drill chuck accepting a 0.0472-inch straight-cylindrical shank. Conforms to DIN 338 jobber-length geometry.

Installation Notes

Machinists and maintenance technicians should secure the workpiece fully before drilling to prevent movement on small-diameter passes. Use cutting fluid or a suitable metalworking lubricant when drilling steel to extend bit life and maintain tolerance. Verify chuck runout before use, as excessive runout will cause premature breakage on bits in this diameter range. Inspect the bit for chipping or dulling before each use; small-diameter HSS bits are susceptible to breakage if fed too aggressively.