Chicago-latrobe 47339 Jobber Drill Bit 9.7mm Hss

Product Description

The CHICAGO-LATROBE 47339 is a jobber-length twist drill bit designed for general-purpose drilling in cast iron and steel. It is manufactured from high speed steel with an oxide coating that reduces friction and heat buildup during use. The bit measures 9.7 mm (0.3819 inches) in diameter with a 118-degree standard point angle and a right-hand spiral flute configuration. Overall length is 133 mm (5.24 inches) with a flute length of 87 mm (3.43 inches). The straight-cylindrical shank allows direct mounting in standard drill chucks. This bit is suited for shop technicians, maintenance mechanics, and trade professionals performing metal drilling tasks.

The 47339 fits applications involving ferrous metals, including cast iron and steel stock commonly encountered in HVAC equipment fabrication, plumbing rough-in, electrical panel work, and general mechanical maintenance. The Series 150 designation places it in a general-purpose line built to DIN 338 specifications. The two-flute spiral design provides reliable chip evacuation in through-hole and blind-hole drilling scenarios at standard machine or handheld drill speeds.

Key Features

• High speed steel construction with oxide coating for reduced friction and extended tool life
• 118-degree standard point angle with web-thinned, tapered web configuration for easier starts
• Right-hand cut, regular spiral flute for efficient chip removal in ferrous metals
• Straight-cylindrical shank fits standard 3-jaw drill chucks without adapters
• Meets DIN 338 specification for jobber-length twist drills
• Diameter tolerance held to -0.0010 to 0.0000 inches for consistent hole sizing

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard drill chucks accepting a 0.3819-inch straight-cylindrical shank. Rated for primary workpiece materials of cast iron and steel per manufacturer specification.

Installation Notes

Install the bit into a properly sized drill chuck and tighten securely before operation. Ensure the workpiece is clamped or secured before drilling to prevent rotation and bit breakage. Apply cutting fluid when drilling steel to manage heat and prolong bit life. Inspect the cutting edges for wear or damage before each use and replace bits that show chipping or excessive dulling.