Product Description
Milwaukee SDS+ Bit 7/32 in. x 4 in. x 6 in.
Model Number: 48-20-7421
The Milwaukee 48-20-7421 is an SDS+ rotary hammer drill bit in 7/32 in. diameter with a 4 in. working length and 6 in. overall length — a compact, small-diameter SDS+ concrete drilling bit for anchor pilot holes, concrete screw installations, and light-duty anchor drilling in confined locations where a short, maneuverable bit is needed. The 7/32 in. diameter is a frequently specified pilot hole size for light-duty concrete anchors and concrete screws used in conduit support brackets, sign mounting, equipment anchoring, and general concrete fastener installations throughout commercial and residential construction. Milwaukee SDS+ concrete drill bits are manufactured with carbide cutting tips vacuum-brazed to heat-treated alloy steel shanks — the vacuum brazing process creates a strong metallurgical bond between the carbide insert and the steel shank that maintains positive tip retention under the combined impact and rotation forces of SDS+ rotary hammer drilling throughout the life of the bit.
Two precision-ground carbide cutting edges engage the concrete surface simultaneously on each rotation, progressively scoring, crushing, and pulverizing the concrete matrix ahead of the advancing bit. The helical flute geometry engineered into the bit body continuously evacuates the pulverized concrete from the base of the hole to the surface throughout the drilling operation, preventing debris accumulation at the drill point that would cause binding, generate excessive heat, and reduce penetration rate. The 6 in. overall length makes this bit ideal for overhead anchor installations in ceiling slabs, horizontal anchor drilling in concrete walls near obstructions, and other confined-space drilling applications where a longer bit would make the drill difficult to position and control accurately. The SDS+ shank provides quick, tool-free bit engagement in all SDS+ rotary hammer chuck systems.
For high-volume small anchor installation projects, the 25-pack bulk packaging (48-20-7521) provides significant per-bit cost reduction compared to individual unit pricing, making it the economical standard purchase for commercial anchor installation crews.
Features
- Carbide tips vacuum-brazed to heat-treated steel shank for positive retention under impact drilling
- Dual cutting edges for efficient progressive concrete scoring and pulverization
- Helical flute geometry for continuous debris evacuation during drilling
- Compact 6 in. overall length for overhead, horizontal, and confined-space anchor drilling
- SDS+ shank for tool-free engagement — compatible with all SDS+ rotary hammers
Specifications
- Diameter: 7/32 in.
- Working Length: 4 in.
- Overall Length: 6 in.
- Shank: SDS+
- Tip: Carbide, Vacuum-Brazed
Includes
- (1) Milwaukee 48-20-7421 SDS+ Bit 7/32 in. x 4 in. x 6 in.
