Skip to main content


General Kinematics STM-SCREEN™ Two-Mass Vibratory Screens utilize GK’s proven Two-Mass, natural frequency drive design. This design is load responsive and capable of longer material retention times to work the material more. This means you can get more screening accomplished in the same footprint as your old brute force screens. Dual in-board vibratory motors eliminate expensive belts, shafts, and bearings. Our patented modular design uses a center spline to significantly increase structural integrity and allows for easy assembly and disassembly for quick transport and installation.

RELIABILITY – Experience the most reliable screen in the industry with an average service life 5X that of a brute force model.

EFFICIENCY – Improve your throughput by at least 30%.

CAPACITY – Increase your screening capacity by up to 40%. 4x retention rate for improved screening. 

All these features combine to provide increased uptime, longer service intervals, significantly increased throughput, and the lowest cost of ownership available in a vibrating screen package.

Technical Info

Technical study

Technical Study

Screen Smarter

Two Mass

What is Two-Mass?

The new screening technology


Lab Tested

Screen circuit

Two Mass


Two-Mass side by side comparison


Gold Screening

Location: Ontario, Canada

Double Deck

1.8 m wide x 4.9 m long screening area

(1) 11 kW Power Requirement 

Product: Gold Ore

Capacity:  200 MTPH

Aperture: 60 mm, 20 mm


Sand Screening

Location: Araijan, Panama.

Single Deck

1.8 m wide x 4.9 m long screening area 

(1) 11 kW Power Requirement 

Product: Sand

Capacity:  100 MTPH

Aperture: 3 mm


Iron Ore Screening

Location: Western Australia, Australia

(8) Model STM-D3685B

Double Deck

3.6 m wide x 8.5 m long screening area 

(2) 15 kW Power Requirement 

Design Capacity:  3,600 MTPH

Aperture: 12 mm, 8 mm


Copper Screening

Location: B.C. Canada.

Single Deck

3.6 m wide x 8.5 m long screening area 

(4) 11 kW Power Requirement 

Capacity:  2,700 MTPH

Aperture: 11/15/18 mm



Limestone Screening

Location: Mississippi, USA.

Triple Deck

1.8 m wide x 4.5 m long screening area

(2) 11 kW Power Requirement 

Capacity: 510 STPH

Aperture: 75 mm, 50 mm, 20 mm


Slag Screening

Location: Indiana, USA

(2) Model STM-S2473

Single Deck

2.4 m wide x 7.3 m long screening area

(2) 11 kW Power Requirement  

Capacity:  150 MTPH

Aperture: 20 Mesh



Case Studies

Laboratory Testing

General Kinematics’ STM-SCREENtesting replicates actual process conditions of SAG, AG, HPGR, or Crusher Circuits.

Key Elements

Belt Feeder to meter in material to replicate actual bed depth and equivalent volume as your process screen.

Test Screen with ± 3000 mm length by 300 mm width screening area. Overs from the screen are recirculated 3-5 times, enabling a scale up to 4.8M Wide by 12M Long Single Deck or Dual Deck STM-SCREEN.

Metered Water Manifold and Spray Bars (wet screening) to achieve equivalent material-to-water ratios of material slurry entering the screen and watered spray along the length of the screen surface.

Testing Lab Equipment Ro-Tap Sieves, Drying Oven, and Weight Scales to analyze and document each passing of material over the test screen for PSD, Screening Efficiency & percentage of Moisture.

Lab Screen Set-Up Options

  • Angle of Incline: Flat to 20+ degrees
  • Angle of Throw: 35 to 55 degrees
  • RPM: 500 to 1000
  • Stroke: 3mm to 12.5mm
  • Material Rate of Speed: 0.2 to 0.5 m/s