Product Description
Milwaukee SDS+ Bit 1/4 in. x 18 in. x 20 in.
Model Number: 48-20-7438
The Milwaukee 48-20-7438 is an SDS+ rotary hammer drill bit in 1/4 in. diameter with an 18 in. working length and 20 in. overall length — the maximum extended-length configuration for the 1/4 in. SDS+ bit, providing the deepest reach available in this small diameter for specialty applications where through-wall penetrations, long-reach anchor pilot holes, or drilling position constraints require extreme working depth at the 1/4 in. bore. The 20 in. overall length enables drilling through thick multi-wythe masonry construction, through structural assemblies with combined component depths exceeding the reach of all standard and intermediate-length 1/4 in. configurations, and from drilling positions far back from the work surface where structural obstructions prevent the SDS+ hammer from being placed in the normal working position adjacent to the drilling location.
At 1/4 in. diameter and 18 in. working length, Milwaukee's flute engineering for this extreme-length small-diameter bit is the critical performance specification — the 1/4 in. bore generates limited flute cross-section volume for concrete debris transport over the 18 in. working depth, making precise flute pitch and geometry optimization essential for maintaining adequate hole evacuation without the choking that would require frequent drill withdrawal during production drilling. Milwaukee engineers the flute specification specifically for this diameter-length combination to keep concrete debris moving continuously from the base of the hole to the surface throughout the drilling operation. The SDS+ shank provides tool-free engagement in all SDS+ rotary hammers. This is a specialty bit for applications requiring the specific combination of 1/4 in. diameter and 20 in. overall reach not achievable with any other standard SDS+ configuration at this diameter.
See Milwaukee's complete 44 Magnum SDS+ catalog for all available lengths at the 1/4 in. diameter — the 20 in. is the maximum standard reach for this bore size.
Features
- 20 in. overall length — maximum reach for the 1/4 in. SDS+ diameter specification
- Carbide tip vacuum-brazed to heat-treated steel shank for extreme-depth small-bore drilling
- Flute optimized for debris evacuation through full 18 in. working depth
- 1/4 in. for concrete screw anchors and light-duty fasteners at extreme depths
- SDS+ shank for tool-free engagement on all SDS+ rotary hammers
Specifications
- Diameter: 1/4 in.
- Working Length: 18 in.
- Overall Length: 20 in.
- Shank: SDS+
- Tip: Carbide, Vacuum-Brazed
Includes
- (1) Milwaukee 48-20-7438 SDS+ Bit 1/4 in. x 18 in. x 20 in.
