Chicago-latrobe 47477 3/16 Inch Hss Jobber Drill Bit 118 Deg

Product Description

The CHICAGO-LATROBE 47477 is a jobber length drill bit designed for general-purpose drilling in cast iron and steel. Built from high speed steel with an oxide finish, this 3/16 inch diameter bit features a 118-degree standard point angle and a spiral, regular-helix flute configuration. The web-thinned, tapered web design reduces thrust at the point and aids in chip clearance during penetration. With an overall length of 3.5 inches and a flute length of 2.3125 inches, the 47477 fits standard drill chucks and is appropriate for use in both hand-held and drill press applications. Licensed tradespeople and skilled tradespeople handling metal fabrication or mechanical work will find this a reliable general-purpose option.

This bit is suited for residential and light commercial applications where drilling into cast iron or steel is required. Typical install scenarios include mechanical rooms, HVAC equipment frames, electrical enclosures, pipe hangers, and structural steel connections. The tanged shank with a shank diameter of 3/16 inch seats securely in compatible chucks. The Series 250AN designation places this bit in a standardized jobber length family, making it straightforward to source as a replacement when worn bits need to be swapped out on the job.

Key Features

• 3/16 inch diameter with a diameter tolerance of -0.0007 to 0.0000 inches for consistent hole sizing
• 118-degree standard point angle for general-purpose entry into cast iron and steel
• High speed steel construction with oxide coating for surface protection and reduced friction
• Web-thinned, tapered web reduces drilling thrust and improves chip evacuation
• Right-hand cut, regular-helix spiral flute with 2 flutes for efficient chip clearing
• Tanged shank, 3/16 inch shank diameter, compatible with standard drill chucks

Compatibility

Designed as an OEM-style general-purpose jobber length drill bit suitable for use with standard 3/8 inch and 1/2 inch keyed or keyless drill chucks. Primary workpiece materials are cast iron and steel as specified by the manufacturer.

Installation Notes

This bit is typically used by HVAC technicians, plumbers, electricians, and general tradespeople during equipment installation or structural drilling tasks. Secure the bit firmly in the chuck and verify the workpiece is clamped or fixtured before drilling to prevent walking. Use appropriate cutting fluid or lubricant when drilling through steel to extend bit life and maintain hole tolerance. Replace the bit when point geometry shows wear to avoid oversized or off-tolerance holes.