9/16" S&D Black Oxide Drill Bit

The Milwaukee 48-89-2740 is a 9/16" Thunderbolt® black oxide drill bit, and it marks a step into the largest “S&D (Silver & Deming) / reduced shank” size range in Milwaukee’s standard drill bit lineup.

Key Features

• Black oxide coating – reduces friction and helps resist corrosion
• 135° split point tip – starts on contact and prevents walking for accurate drilling
• Parabolic flute design – clears chips quickly for faster, cooler drilling
• 3-flat Secure-Grip shank (reduced shank) – fits 1/2" chucks despite large bit diameter
• Heavy-duty web design – increases strength for deep hole drilling

Specs

• Size: 9/16 in
• Shank: 1/2" reduced (fits standard drill chucks)
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Use: Metal, wood, PVC, plastics
  (milwaukeetool.com, mc-mc.com)

Best Uses

• Large structural bolt holes
• Steel fabrication and heavy construction
• Wood beams and framing
• HVAC, plumbing, and mechanical installs
• Any application requiring a big-diameter hole with a standard drill

Bottom Line

The 48-89-2740 is no longer a “standard twist bit size”—it’s part of Milwaukee’s heavy-duty reduced-shank drilling line, built for big holes while still working in a normal 1/2" drill chuck.