29/64" Thunderbolt® Black Oxide Drill Bit

The Milwaukee 48-89-2735 is a 29/64" Thunderbolt® black oxide drill bit, part of Milwaukee’s standard jobber-length drill bit lineup used for general-purpose drilling in metal, wood, and plastic.

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 improves strength and resists breakage under side load
• Parabolic flute design – clears chips quickly for cooler, faster drilling
• 3-flat Secure-Grip shank – reduces slipping in the drill chuck

Specs

• Size: 29/64 in (0.4531")
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Length: ~5-5/8" 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 48-89-2735 is a large standard “workhorse” drill bit, not a specialty bit. It’s designed for reliable everyday drilling at larger diameters, especially for structural and fastening applications.