Chicago-latrobe 47331 9mm Hss Jobber Length Drill Bit

Product Description

The CHICAGO-LATROBE 47331 is a jobber length drill bit designed for general-purpose drilling in metal and cast iron applications. Built from high speed steel with an oxide coating, it offers improved lubricity and basic corrosion resistance during operation. The bit measures 9 mm (0.3543 inches) in diameter with an overall length of 125 mm (4.921 inches) and a flute length of 81 mm (3.189 inches). The 118-degree standard point angle suits most ferrous and non-ferrous drilling work. Two spiral flutes with a regular helix clear chips effectively, and the web-thinned, tapered web configuration reduces thrust during entry. Licensed trades and maintenance machinists reach for this bit when production and service drilling demands a reliable, proven geometry.

The 47331 is sized for applications involving steel and cast iron workpieces in both shop and field environments. The straight-cylindrical shank seats directly in standard three-jaw drill chucks across handheld drills, drill presses, and CNC machining centers. Its jobber length proportions make it practical for through-hole and blind-hole work in structural steel, pipe flanges, brackets, and general fabrication stock. The Series 150 designation places it in Chicago-Latrobe's general-purpose line, making it a standard choice for maintenance, repair, and light production drilling where tooling costs and replacement frequency both matter.

Key Features

• High speed steel construction with oxide finish for improved wear and lubricity
• 118-degree standard point angle for general-purpose entry into steel and cast iron
• Web-thinned, tapered web reduces drilling thrust and walking tendency
• Two regular-spiral flutes provide consistent chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Conforms to DIN 338 specification for consistent dimensional tolerances

Compatibility

Designed as a general-purpose jobber length drill bit suitable for use with standard three-jaw drill chucks on handheld drills, drill presses, and compatible machining equipment. Intended for drilling steel and cast iron workpieces per its Series 150 general-purpose rating.

Installation Notes

Installation and use should be performed by qualified machinists, tradespeople, or maintenance technicians familiar with drill press and hand-drill operation. Secure the workpiece firmly before drilling and ensure the chuck is fully tightened on the straight shank before starting the spindle. Use appropriate cutting fluid or coolant when drilling ferrous materials to extend tool life and maintain dimensional accuracy. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.