Description
Milwaukee Flat Boring Bit 1-1/4 in. x 6 in.
Model Number: 48-27-1251
The Milwaukee 48-27-1251 is a 1-1/4 in. x 6 in. Flat Boring Bit — a large flat boring bit for drilling the large-diameter holes through framing lumber, dimensional wood, and wood composites required for plumbing drain and vent pipe, larger flexible conduit systems, and HVAC rough-in penetrations where the 1-1/4 in. bore provides the correct opening for the material being routed. The 1-1/4 in. diameter is one of the largest standard flat boring bit sizes, used for the biggest plumbing rough-in penetrations and large conduit applications that require a clean, accurately-sized flat-bottom hole through wood framing rather than the more aggressive self-feed auger approach. The flat boring geometry uses a sharp outer spur to score the hole perimeter and a flat cutting face to shear wood fiber cleanly within the scored circle on both entry and exit faces — producing the clean hole edges that firestop systems, grommet sleeves, and finish trim plates require for a professional appearance and code-compliant installation.
Made from heat-treated high carbon steel, Milwaukee’s flat boring bit maintains the cutting edge sharpness needed for clean, consistent holes across the high daily drilling volumes of commercial rough-in projects. The self-centering tip prevents bit walking and establishes the hole accurately at the marked center location before the cutting face engages — important at the 1-1/4 in. diameter where a mislocated hole that must be patched and redrilled creates a significantly larger repair requirement than smaller bore errors. The flat boring bit’s geometry at this large diameter is particularly well-suited to the plumbing applications where 1-1/4 in. drain line rough-in is the specification — plumbers use flat boring bits at large diameters because the clean exit face and accurate diameter minimize interference with pipe routing compared to the rougher holes that self-feed bits sometimes produce at the largest bore sizes.
Available in 16 in. extended length — Milwaukee’s flat boring bit range covers 1/4 in. through 1-1/2 in. in both 6 in. and 16 in. lengths for complete coverage.
Features
- 1-1/4 in. large bore for plumbing drain/vent, large flex conduit, and HVAC rough-in
- Flat boring geometry for clean entry and exit faces vs. rougher auger drill exits
- Heat-treated high carbon steel for sustained sharpness in production drilling
- Self-centering tip for accurate hole location at large bore diameters
- Available in 16 in. extended length — range covers 1/4 in. through 1-1/2 in.
Specifications
- Diameter: 1-1/4 in.
- Length: 6 in.
- Material: Heat-Treated High Carbon Steel
- Available Lengths: 6 in. and 16 in.
Includes
- (1) Milwaukee 48-27-1251 Flat Boring Bit 1-1/4 in. x 6 in.
