Milwaukee 48-89-2740 Black Oxide Jobber Drill Bit 6in

Product Description

The MILWAUKEE 48-89-2740 is a black oxide jobber-length twist drill bit engineered for performance in a wide range of materials including low and high tensile strength metals, stainless steel, and cast iron. Built from industrial-grade steel, it features a 135-degree split point that starts on contact to prevent walking and a parabolic flute geometry that clears chips rapidly during deep or shallow drilling operations. The reduced shank with three milled flats locks securely in standard jawed chucks to prevent slippage. This bit is sold individually and is suited for use by professional metalworkers, machinists, pipefitters, and general tradespeople requiring reliable hole-making performance.

The 48-89-2740 is designed for jobsite and shop applications where drilling into ferrous and non-ferrous metals is routine. Its reduced shank diameter allows it to fit standard 1/2 inch chucks, making it compatible with a broad range of corded and cordless drill drivers and drill presses. The 6 inch overall length provides reach for deeper through-hole applications without requiring an extension. Typical use cases include drilling through structural steel, pipe flanges, metal plate, and cast iron components in mechanical, plumbing, and electrical trade environments.

Key Features

• 135-degree split point starts on contact, eliminating center-punch requirements and preventing bit walking
• Parabolic flute geometry accelerates chip ejection during deep drilling passes
• Thicker web construction increases torsional strength and extends service life
• Three-flat reduced shank prevents rotation in 1/2 inch jawed chucks
• Black oxide coating provides lubricity and corrosion resistance throughout the bit body

Compatibility

Designed for use in standard 1/2 inch keyed or keyless jawed chucks on corded and cordless drills and drill presses; suitable for drilling low to high tensile strength metals, stainless steel, and cast iron.

Installation Notes

This bit is installed and operated by machinists, pipefitters, electricians, and general tradespeople using handheld drills or drill presses. Secure the three-flat shank fully into the chuck before operation and verify the chuck is tightened on all three jaws. Use cutting fluid when drilling stainless steel or hard cast iron to extend bit life and manage heat buildup. Inspect the cutting edges for wear or chipping before each use and replace the bit if the split point is damaged.