Orbital Sieve Shakers are portable, cost-effective and easy-to-use units widely used in particle size testing of mineral aggregates and for sieve gradations of many other free-flowing granular materials. The back and forth lateral action combines with up/down and tilting actions to move specimens in an orbit across the sieve cloth. Particles are exposed to the entire mesh area of the test sieve, and size fractions are quickly separated. Designed primarily for sieve sizes from No.4 to No.200 (4.75mm to 75µm), they are also effective for larger particles when specifications permit. These units feature the Gilson EZ-Clamp System for fast and secure clamping of the sieve stack.