Rotary Hammers: When Standard Drilling Isn’t Enough
When you need to drill through concrete, block, or stone efficiently and cleanly, a rotary hammer is the only professional answer. Standard hammer drills use a cam-and-ratchet mechanism that rattles rather than strikes — rotary hammers use a true piston-driven impact mechanism that delivers far more energy per blow. DeWALT and Milwaukee have strong SDS-Plus offerings that deserve close comparison.
DeWALT DCH133B: Compact SDS-Plus Powerhouse
The DCH133B on 20V MAX delivers 1.7 joules of impact energy — the standard for 1-inch and under concrete drilling in most construction applications. Its SHOCKS active vibration control reduces vibration by 50% compared to standard rotary hammers, significantly reducing fatigue during extended concrete drilling sessions. The 3-mode selector covers rotary hammer, hammer only (chiseling), and rotation only (drilling without hammer) modes. At 4.6 lbs with battery, it’s one of the lightest cordless SDS-Plus hammers available.
Milwaukee M18 FUEL 2712-20: Maximum Concrete Performance
Milwaukee’s M18 FUEL SDS-Plus rotary hammer steps up with 2.0 joules of impact energy — 18% more than the DeWALT — and a POWERSTATE brushless motor that maintains consistent blow energy even as the battery depletes. Its SHOCKSHIELD anti-vibration system uses dual-plane vibration damping for outstanding comfort during extended chiseling. The FIXTEC chuck allows accessory-free bit changes. Milwaukee’s DRIVE CONTROL enables 4-speed control for matching drilling speed to hole size and material density.
SDS-Plus Bits and Accessories
Both tools accept standard SDS-Plus shank bits from any manufacturer — Bosch, Diablo, Irwin, and Hilti all make excellent bits for either tool. For standard concrete: carbide-tipped multi-purpose bits. For reinforced concrete: specialty rebar-rated bits (Diablo SDS-Plus Rebar Demon). For chiseling: flat chisels and bull-point chisels. Both brands also offer dedicated dust extraction attachments for clean, OSHA-compliant drilling — increasingly required on commercial sites.
Drilling Speed Comparison
In 3/4-inch hole tests through 4,000 PSI concrete, the Milwaukee completes holes approximately 15% faster than the DeWALT, attributable to its higher impact energy. For occasional concrete drilling, the difference is negligible. For crews drilling dozens of anchor holes per day, the Milwaukee’s speed advantage translates to meaningful time savings.
The Verdict
For vibration reduction and compact weight: DeWALT DCH133B. For maximum drilling speed and impact energy: Milwaukee M18 FUEL 2712-20. Both are excellent professional tools — find them at Pro Tools Hub.
