An orbital shaker moves samples in a smooth, circular (orbital) motion to mix them gently and uniformly. That consistent action makes it a lab favorite for suspending cells, growing bacterial cultures, staining and destaining gels, washing blots, and general mixing. Picking the right one means matching the motion, capacity, and duty rating to the work you do.
How orbital motion compares to other shakers
Orbital shakers provide even, low-shear mixing that's gentle on cells — ideal for biological samples. Reciprocating (back-and-forth) and rocking motions suit other tasks, so if your protocols call for wave-like or side-to-side action, factor that in. Many labs standardize on orbital motion because it covers the widest range of routine applications.
Key factors to consider
- Speed range: Low speeds (around 25–50 RPM) protect delicate cells, while higher speeds drive vigorous microbial cultures and mixing. A wide, well-controlled range adds versatility.
- Orbit diameter: A larger orbit (e.g., 19–25 mm) improves aeration and mixing in flasks; a smaller orbit suits microplates and lower-volume vessels.
- Load capacity and platform: Match the platform size and interchangeable clamps or non-slip mats to your flasks, tubes, plates, or bottles.
- Environment rating: If the shaker will run inside an incubator, cold room, or CO2 environment, confirm it's rated for high humidity and temperature extremes.
- Duty cycle and drive: For continuous or 24/7 use, choose a brushless, maintenance-free motor built for continuous duty.
Getting reliable, repeatable mixing
Balance the platform load, secure vessels so nothing walks or spills at speed, and set speed to the vessel and volume — too fast can slosh and foam, too slow won't aerate. A stable, level surface keeps the shaker quiet and consistent. Thinking through vessel type and fill volume up front avoids most mixing problems.
See our Laboratory Orbital Shakers, or explore the full lab shakers and mixers range for rockers, rotators, and reciprocating models.