Product Description
Milwaukee Flat Boring Bit 1-1/8 in. x 6 in.
Model Number: 48-27-1121
The Milwaukee 48-27-1121 is a 1-1/8 in. x 6 in. Flat Boring Bit — a professional-grade large-diameter wood boring bit for drilling clean, accurately-sized holes through wood framing members, structural lumber, plywood, OSB sheathing, Formica, and plastic for electrical conduit penetrations, plumbing rough-in, cable management, and general construction applications requiring precise, clean-edged larger holes. The 1-1/8 in. diameter is a commonly specified size for 3/4 in. and 1 in. flexible conduit penetrations, cable management grommet installations, and medium-diameter plumbing rough-in penetrations through wood framing where a hole of this specific diameter provides the correct clearance for the material being routed without unnecessarily weakening the framing member with an oversized opening. Milwaukee flat boring bits are manufactured from heat-treated high carbon steel — the elevated carbon content and precise heat treatment process engineer the hardness profile needed for the cutting edge to maintain sharpness through a sustained high volume of holes in wood and engineered wood products without requiring frequent sharpening or bit replacement.
The flat boring bit geometry uses a sharp outer spur and a flat, sharp-edged cutting face that shears wood fiber cleanly during the cutting stroke, producing smooth, well-defined hole walls with minimal splintering or wood fiber tear-out on both the entry surface and the exit surface of the through-hole. This two-face hole quality is particularly valuable in applications where both surfaces of the drilled member are visible or where a clean hole exit reduces fiber interference with the material being routed through the opening. A precision-ground self-centering point at the tip of the bit engages the workpiece surface at the marked hole location and maintains bit position before the cutting face engages, preventing the bit from walking away from the intended hole location on smooth or angled surfaces — maintaining hole position accuracy is especially important when drilling at angles through inclined joists, angled blocking, and other non-perpendicular framing members encountered in stairways, roof structures, and complex framing configurations.
Milwaukee flat boring bits are available across the full range from 1/4 in. through 1-1/2 in. diameter in standard 6 in. length for single-member drilling, and in extended 16 in. lengths for deep drilling through multiple stacked framing members, built-up beams, and thick structural sections where the 6 in. bit cannot achieve the required hole depth.
Features
- Heat-treated high carbon steel for sustained cutting edge sharpness through high-volume drilling
- Flat boring geometry produces clean, smooth hole walls with minimal splintering on entry and exit
- Self-centering tip prevents bit walking on smooth and angled work surfaces
- 1-1/8 in. diameter for 3/4 in. and 1 in. flex conduit, plumbing, and cable management
- 6 in. length for single-member drilling — also available in 16 in. extended length
Specifications
- Diameter: 1-1/8 in.
- Length: 6 in.
- Material: Heat-Treated High Carbon Steel
- Available Diameters: 1/4 in. through 1-1/2 in.
- Available Lengths: 6 in. and 16 in.
Includes
- (1) Milwaukee 48-27-1121 Flat Boring Bit 1-1/8 in. x 6 in.
