SDS Drills Explained: Choosing the Right Hammer Drill

SDS drills exist because regular hammer drills have limits. When you need to drill into concrete, stone, or hard masonry regularly, an SDS makes the job faster and easier.

What Makes SDS Different

SDS (Slotted Drive System) uses a specialised chuck that locks bits in place while allowing them to move slightly. This design transfers hammer energy more efficiently than standard chucks. The difference in drilling speed and effort is dramatic.

SDS Plus vs SDS Max

• SDS Plus: Smaller shank (10mm), lighter tools, holes up to about 26mm, suits most trade work
• SDS Max: Larger shank (18mm), heavier tools, holes up to 52mm+, demolition-capable

Most tradespeople need SDS Plus. SDS Max is for heavy construction, breaking out concrete, and large-diameter holes.

Operating Modes

Quality SDS drills offer multiple modes:

• Hammer only: For chiselling and demolition
• Hammer + rotation: For drilling masonry
• Rotation only: For drilling without impact (some models)

Choosing an SDS Drill

Consider:

• Power: Joules of impact energy (more = faster drilling in hard materials)
• Weight: Heavier drills tire you faster, especially overhead
• Chuck type: Keyless SDS chucks are standard now
• Dust extraction: Optional attachments reduce cleanup and health risks

Corded vs Cordless

Cordless SDS drills from DeWalt and Makita now match smaller corded models for most tasks. For heavy, continuous drilling, corded still offers advantages. For flexibility and convenience, cordless wins.

Bit Selection

SDS bits come in various types:

• Standard masonry: General concrete and brick
• Rebar cutters: When you might hit reinforcement
• Chisels: Various shapes for different demolition tasks
• Core bits: For larger holes in masonry

Quality bits last longer and drill straighter. Cheap bits often aren't worth the savings.