SDS Max 4CT MX4™ 1-5/8" X 18" X 23"

The Milwaukee SDS-MAX 4CT MX4™ 1-5/8" x 18" x 23" is a large-diameter, heavy-duty rotary hammer drill bit built for high-load drilling in concrete and reinforced concrete. At this size, you’re firmly in structural and anchor-grade drilling, where torque, durability, and rebar performance are critical.

Performance & Design

• Solid carbide 4-cutter head
  Delivers up to 5× longer life in concrete with rebar and maintains cutting efficiency under heavy load
• 4-cutter geometry
  Prevents binding and lock-up when contacting rebar, keeping drilling smooth and controlled
• Rebar guards
  Reinforce the cutting edges for durability in hard aggregate and embedded steel
• Sharp centering tip
  Improves hole accuracy and prevents walking at startup
• Variable flute design
  Clears dust faster, reducing heat and improving drilling efficiency (especially important at larger diameters)
• Wear mark indicators
  Show when the bit no longer meets ANSI anchor tolerances

Size & Capacity

• Diameter: 1-5/8"
• Usable cutting length: 18"
• Overall length: 23"
• Shank: SDS-Max (large rotary hammers only)

Ideal For:

• Large-diameter anchor holes
• Structural and seismic anchoring
• Reinforced concrete (rebar-heavy environments)
• Mechanical, electrical, and plumbing penetrations
• Commercial, industrial, and infrastructure work