7/16" Thunderbolt® Black Oxide Drill Bit

The Milwaukee 48-89-2734 is a 7/16" Thunderbolt® black oxide jobber drill bit used for general-purpose drilling in wood, metal, and plastic. It’s one of the larger standard sizes in the Thunderbolt lineup and is designed for heavy-duty everyday drilling tasks.

Key Features

• Black oxide coating – reduces friction and improves corrosion resistance
• 135° split point tip – starts on contact and prevents walking for accurate holes
• Thunderbolt reinforced web – thicker core increases strength and resists breakage under side load
• Parabolic flute design – clears chips quickly to keep drilling cooler and faster
• 3-flat Secure-Grip shank – helps prevent slipping in the drill chuck

Specs

• Size: 7/16 in (0.4375")
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Length: ~5-1/2" jobber length
• Use: Metal, wood, PVC, plastics

Best Uses

• Large bolt and anchor holes
• Structural steel and fabrication work
• Construction framing and heavy assembly
• Sheet metal and light steel drilling
• General jobsite drilling

Bottom Line

The 48-89-2734 is a large standard-purpose drill bit, not a specialty cobalt or impact bit. It’s part of Milwaukee’s basic Thunderbolt line built for reliable, everyday drilling in common materials at larger diameters.