Product Description
Milwaukee 3/8 in. x 18 in. MX4 SDS+ Carbide Drill Bit
Model Number: 48-20-7357
The Milwaukee 48-20-7357 is a 3/8 in. diameter x 16 in. flute length x 18 in. overall length MX4 SDS+ Carbide Drill Bit — the extended ultra-deep-reach configuration of Milwaukee's premium four-cutter MX4 bit at the most heavily used commercial anchor diameter, providing the deepest working depth available in the 3/8 in. MX4 SDS+ lineup for the most demanding structural anchor installations and through-penetration applications. The MX4 four-cutter tip delivers four carbide cutting contacts per revolution versus the standard two-cutter geometry of conventional SDS+ bits — faster penetration rate and extended bit life from doubled carbide wear distribution — maintained through the full 16 in. working depth of this extreme-length configuration. The 18 in. overall length enables through-wall drilling in thick CMU construction with additional finish thickness, extra-deep structural anchor embedments specified for the highest pull-out load ratings in critical structural connections, and drilling from positions where the hammer cannot be placed close to the drilling surface due to surrounding structural elements.
At 3/8 in. diameter and 18 in. overall length, Milwaukee's flute engineering for the MX4 at this combination of small diameter and extreme working depth is the critical design element for sustained production performance — the 3/8 in. bore generates limited flute cross-section volume for concrete debris transport over the 16 in. working depth, requiring precise flute pitch and geometry optimization to maintain effective hole evacuation throughout the full depth without the choking that would require frequent drill withdrawal to clear the hole. Milwaukee engineers the flute specification specifically for this diameter-length combination, keeping concrete debris moving continuously from base to surface throughout production anchor drilling operations. The SDS+ shank provides tool-free engagement in all SDS+ rotary hammers for fast bit changes.
See Milwaukee's complete MX4 SDS+ lineup for all available diameters and lengths in the premium four-cutter specification.
Features
- MX4 four-cutter tip for faster speed and longer life than standard 2-cutter SDS+ bits
- 18 in. overall length for deepest structural anchor embedments and thick-wall penetrations
- 16 in. flute length with optimized geometry for debris evacuation at extreme depth
- 3/8 in. — most heavily used commercial anchor diameter where MX4 delivers peak value
- SDS+ shank for tool-free engagement on all SDS+ rotary hammers
Specifications
- Diameter: 3/8 in.
- Flute Length: 16 in.
- Overall Length: 18 in.
- Tip: MX4 4-Cutter Carbide
- Shank: SDS+
Includes
- (1) Milwaukee 48-20-7357 3/8 in. x 18 in. MX4 SDS+ Carbide Drill Bit
