Chicago-latrobe 50747 Extra Length Drill Bit 0.4062 in Hss

Product Description

The CHICAGO-LATROBE 50747 is an extra length high speed steel drill bit designed for long reach drilling applications where standard-length bits cannot access the work area. With a 0.4062-inch diameter and a 12-inch overall length, the 50747 provides the extended reach needed in deep-hole and hard-to-access drilling scenarios. The 118-degree notched point and web-thinned, tapered web construction reduce thrust requirements and improve centering on entry. The oxide finish offers basic corrosion resistance for shop and field use. This bit is suited for trades and machinists who regularly drill through cast iron and steel in tight or deep work envelopes.

The 50747 is a general-purpose extra length bit from CHICAGO-LATROBE Series 120X. It is used in metalworking, fabrication, and maintenance applications that require drilling beyond the reach of jobber-length bits. Typical install scenarios include structural steel fabrication, HVAC bracket and duct penetration work, plumbing rough-in through deep framing members, and equipment maintenance drilling where clearance is restricted. The right-hand spiral flute direction and straight-cylindrical shank allow use in standard drill chucks without adapters.

Key Features

• 12-inch overall length with 9-inch flute length for extended reach drilling
• 118-degree notched point for reduced entry thrust and improved self-centering
• Web-thinned tapered web reduces cutting resistance in steel and cast iron
• High speed steel construction handles elevated cutting temperatures
• Oxide finish provides basic rust resistance in shop environments
• Straight-cylindrical shank at 0.4062 inches fits standard drill chucks

Compatibility

Designed as a general-purpose extra length drill bit for use in standard drill chucks and drill presses; primary workpiece materials are cast iron and steel as specified by the manufacturer for this series.

Installation Notes

Installation and use should be performed by qualified machinists, pipefitters, HVAC technicians, or other trade professionals familiar with metal drilling procedures. Always secure the workpiece and ensure the drill press or driver is powered down before changing bits. Use appropriate cutting fluid when drilling steel or cast iron to extend bit life and manage heat. Follow applicable OSHA and shop safety standards for rotating tool operation.