Product Description
Milwaukee 12 in. Diamond Premium Wet Core Bit
Model Number: 48-17-3120
The Milwaukee 48-17-3120 is a 12 in. Diamond Premium Wet Core Bit — the largest commonly-used size in Milwaukee's premium diamond core drilling system, engineered for large-diameter core drilling through cured concrete, reinforced concrete slabs, and post-tensioned concrete structures for utility penetrations, mechanical equipment access, and structural openings. Milwaukee Diamond Premium Wet Core Bits are manufactured with only premium-grade diamond segments in an engineered segment bond formulation that achieves the optimal balance between diamond exposure rate and bond durability in demanding concrete drilling conditions — delivering faster initial cutting speed, more consistent speed maintenance as segments wear, and significantly longer overall segment life compared to standard-grade diamond core bits in the same application. At 12 in. diameter, this is a large-scale core drilling tool used for major utility penetrations including storm and sanitary sewer manhole knockouts, large mechanical equipment mounting and access holes, structural column sleeves, large HVAC penetrations, and architectural openings cut through existing concrete structures during renovation and adaptive reuse projects.
Wet cutting with a continuous water supply is mandatory for safe and effective 12 in. diamond core bit operation — the high heat generated by the friction of a 12 in. diameter cutting surface against concrete at drilling speed would cause rapid segment glazing and failure without the cooling effect of water flow across the cutting face during drilling. Water simultaneously provides lubrication that reduces abrasive friction at the cutting interface, carries heat away from the diamond segments to prevent thermal degradation, flushes concrete slurry out of the hole to maintain cutting clearance, and suppresses the concrete silica dust at the source for OSHA silica regulation compliance during the drilling operation. Milwaukee's premium segment bond specification covers sizes from 3/4 in. through 12 in., allowing contractors to standardize on a consistent premium bit system that delivers comparable performance expectations across all diameters used on a project.
Core barrel extensions are available separately for applications where wall or slab thickness exceeds the standard barrel depth, allowing the bit to complete a through-penetration in a single setup without pulling and resetting. For the most demanding pre-stressed, post-tensioned, and heavily reinforced concrete applications, Milwaukee's prestressed concrete core bit line provides a specialized segment specification for those extreme-hardness materials.
Features
- Premium-grade diamond segments — faster speed, longer life than standard core bits in demanding concrete
- Engineered segment bond for consistent performance through the full segment life
- 12 in. diameter for major utility penetrations, sewer knockouts, and structural openings
- Wet cutting required — water cools segments, lubricates cut, and controls silica dust
- Available 3/4 in. through 12 in. for a complete premium core drilling system on any project
Specifications
- Diameter: 12 in.
- Cutting Method: Wet
- Application: Cured Concrete, Reinforced Concrete, Post-Tensioned Concrete
- Available Sizes: 3/4 in. through 12 in.
Includes
- (1) Milwaukee 48-17-3120 12 in. Diamond Premium Wet Core Bit
