Anyone working with rotary hammers or demolition hammers will sooner or later encounter the terms SDS-Plus and SDS-Max. Both refer to special tool holders that were developed for powerful drilling in concrete, masonry, or stone. But what exactly is the difference between them – and which system is the right one for which application?
What does SDS actually mean?
SDS stands for "Steck – Dreh – Sitz" (meaning "Insert – Turn – Fit"; sometimes also referred to as "Special Direct System").
The principle: drills and chisels are inserted without tools and held securely in the rotary hammer by special flutes. At the same time, the system allows for optimal power transmission and reduces wear.
SDS-Plus – The Standard for DIY Enthusiasts and Professionals
SDS-Plus is the most widely used chuck and is employed for light to medium drilling and chiseling tasks.
Typical features of SDS-Plus:
- Shank diameter: 10 mm
- Usually 4 flutes (2 open, 2 closed)
- Suitable for drilling diameters up to approx. 26–30 mm
- Used in compact rotary and combination hammers
- Ideal for DIY enthusiasts, fitters, and trade businesses
Typical applications:
- Dowel holes in concrete and masonry
- Light chiseling work
- Renovation and installation work
SDS-Max – For heavy-duty applications and maximum performance
SDS-Max was developed for large drilling diameters and heavy demolition work. This system is mainly used in professional construction and industrial sectors.
Typical features of SDS-Max:
- Shank diameter: 18 mm
- 5 flutes for maximum power transmission
- Suitable for drilling diameters from approx. 18 mm up to over 50 mm
- Used in heavy rotary and demolition hammers
- High impact energy for intensive work
Typical applications:
- Large breakthroughs in concrete
- Demolition and chiseling work
- Road, building, and civil engineering
SDS-Plus or SDS-Max – which system is the right one?
The choice depends primarily on power requirements and application area:
| Criterion | SDS-Plus | SDS-Max |
|---|---|---|
| Drilling diameter | small to medium | large |
| Machine weight | light | heavy |
| Area of application | Household & Trade | Professional & Construction |
| Impact force | moderate | very high |
Important: SDS-Plus and SDS-Max tools are not compatible. Drills and chisels must always match the respective chuck.
Conclusion
- SDS-Plus is the right choice for most everyday drilling and chiseling tasks.
- SDS-Max excels where power, diameter, and continuous load are crucial.
Anyone who regularly works in concrete should therefore pay attention not only to the machine but also to the appropriate chuck system – as it significantly determines efficiency, safety, and working comfort.
