Product Description
Milwaukee 1/4 in. x 12 in. MX4 SDS+ Carbide Drill Bit
Model Number: 48-20-7335
The Milwaukee 48-20-7335 is a 1/4 in. diameter x 10 in. flute length x 12 in. overall length MX4 SDS+ Carbide Drill Bit — a premium-tier SDS+ concrete bit featuring Milwaukee's MX4 4-cutter carbide tip design that delivers significantly faster drilling speed and longer bit life compared to standard 2-cutter SDS+ bits in the same diameter and application. The MX4 designation refers to the four-cutter carbide tip geometry — where standard SDS+ bits use a two-cutter carbide insert with two cutting edges, MX4 bits use a specialized carbide tip configuration with four active cutting edges that engage the concrete surface simultaneously with each rotation. The additional cutting edges increase the number of concrete scoring and crushing contacts per revolution, advancing the bit into the material faster per unit of rotation and generating more cutting progress per drill RPM than the two-cutter standard design.
The increased cutting contacts also distribute the wear load across more carbide surface area per revolution, extending the carbide tip's service life before reaching the wear level that requires bit replacement. The MX4 four-cutter design benefits are most pronounced in harder concrete — high-strength concrete, aggregate-rich concrete, and mature cured concrete where the higher resistance to penetration amplifies the speed and life advantage of having four cutting contacts versus two on each revolution. The 1/4 in. diameter at 12 in. overall length with 10 in. flute length is an extended-reach small-diameter bit for concrete anchor pilot holes, through-wall penetrations, and deep embedment installations in hard commercial concrete where both the extended length and the MX4 performance advantage are required. The SDS+ shank provides tool-free engagement in all SDS+ rotary hammers for fast setup.
Milwaukee's MX4 SDS+ bit range is available in multiple diameters and lengths for the full range of hard concrete drilling applications where the 4-cutter advantage delivers the most value — see the complete MX4 lineup for all available sizes.
Features
- MX4 four-cutter carbide tip — faster drilling speed and longer life vs. standard 2-cutter bits
- Four cutting edges distribute wear load for extended bit life in hard commercial concrete
- 1/4 in. diameter x 12 in. overall for extended-reach anchor pilot holes in hard concrete
- 10 in. flute length for efficient debris evacuation through full working depth
- SDS+ shank for tool-free engagement on all SDS+ rotary hammers
Specifications
- Diameter: 1/4 in.
- Flute Length: 10 in.
- Overall Length: 12 in.
- Tip: MX4 4-Cutter Carbide
- Shank: SDS+
Includes
- (1) Milwaukee 48-20-7335 1/4 in. x 12 in. MX4 SDS+ Carbide Drill Bit
