Product Description
Milwaukee SDS Max 4CT 1/2 in. x 54 in. x 60 in. Rotary Hammer Bit
Model Number: 48-20-3909
The Milwaukee 48-20-3909 is an SDS Max 4-Cutter (4CT) Rotary Hammer Bit in 1/2 in. diameter with a 54 in. working length and 60 in. overall length — an ultra-deep-reach specialty concrete bit for the most extreme drilling depth requirements in structural and civil construction where standard and extended-length bits cannot reach the required hole depth from the accessible drilling position. At 60 in. overall length, this bit enables drilling through the thickest structural concrete sections, making penetrations through multi-wythe concrete block walls, drilling from the surface of deep concrete foundations to embedment depths required for the highest-rated structural anchors, and accessing drilling locations through multiple architectural layers where the total depth from drill position to required hole bottom exceeds what any standard or extended-length bit can reach without repositioning or intermediate setups.
The 4CT four-cutter carbide tip maintains the cutting speed and bit life advantages of Milwaukee's premium four-cutter technology even at this extreme working length — four cutting contacts per revolution versus the standard two of conventional SDS Max bits, distributing wear across more carbide surface area and maintaining faster penetration rate in hard commercial concrete throughout the full 54 in. working depth. The SDS Max shank transmits the maximum available rotary hammer impact energy to the four-cutter tip for productive drilling at this length in hard concrete where energy delivery is critical for maintaining penetration rate. Milwaukee's flute engineering for this extreme-length bit maintains effective concrete debris evacuation from the base of the hole through the full 54 in. working depth — a critical performance requirement at this extreme length where inadequate flute design would halt progress before reaching the required depth. Note: due to its 60 in. overall length, this item ships via Next Day Air only.
This bit is a specialty procurement item for structural contractors, civil contractors, and foundation specialists who regularly work with extreme-depth anchor installations and structural penetrations beyond the reach of all standard commercial bit lengths.
Features
- SDS Max 4CT four-cutter tip for maximum speed and life at extreme working depths
- 60 in. overall length for the deepest structural anchor and foundation drilling applications
- Four cutting edges maintain faster penetration rate through full 54 in. working depth
- Flute engineered for debris evacuation through extreme 54 in. working depth
- Note: 60 in. length requires Next Day Air shipping only
Specifications
- Diameter: 1/2 in.
- Working Length: 54 in.
- Overall Length: 60 in.
- Shank: SDS Max
- Tip: 4CT Four-Cutter Carbide
Includes
- (1) Milwaukee 48-20-3909 SDS Max 4CT 1/2 in. x 54 in. x 60 in. Rotary Hammer Bit
