SSTM Smart Materials Testing System

United Testing Systems offers a complete line of Universal Testing Machines, equipment and accessories for tensile and hardness testing.

All United Universal Mechanical Testing Machines have a number of standard features developed to give the user the most accurate and efficient results:

  • Twin ball screw drive w/solid-state servo and motor controls. Single ball screw drive for capacities less than 1,000 Lbf.
  • Crosshead guidance system ( maximum lateral motion 0.010" over full crosshead travel).
  • Anti-backlash system.
  • "Emergency Stop" control via rocker switch, computer or mechanical limit switches.
  • Interchangeable, electronic load cell weighing system.
  • USB-connectivity for computerized machines assures data integrity and supported high data transfer rate.
  • Quick-disconnect load cell and fixture system.

An affordable, ultra-accurate, single-column materials table-top testing machine for those low capacity testing needs. Ideal for use in most testing situations including test labs, R&D applications, quality control and production testing.

The SSTM-2.5KN is designed to perform a variety of test routines including tension, compression, flex, shear and peel with user-friendly Windows®-based software. This system is able to test the strength of materials in accordance with most industry standards including ASTM, BS, DIN, ISO and JIS.

Key Features of the SSTM

  • Affordably priced
  • Small footprint
  • Efficient working space
  • Easy to operate
  • USB data connectivity
  • Interchangeable load cells (optional)
  • Compatible with various extensometers
  • Variable speeds from 0.001” to 40”/minute
  • Two-year guarantee
  • Made in USA

Data Acquisition and Control

The SSTM-2.5KN incorporates a PC-compatible computer for data acquisition and machine control functions. The machine includes the following features:

  • USB connectivity for high speed data acquisition and control.
  • Preload, Test, Stop, and Return operations initiated with one keystroke.
  • Preload Force, Test Speed and Return Speed may be preset.
  • JOG controls allow fast and accurate crosshead setup.
  • Automatic Stop or Return following sample break.
  • Graphic display in real time – Load or Stress vs. Extension.
  • Load measurement accuracy: ±0.5% of reading from 1% to 100% of rated capacity.
  • Extension from crosshead: resolution = 0.12 micron/jaw separation. Accuracy = ±83 microns/meter of travel.
  • Extension from extensometers: resolution = 1/262144 of full range. Accuracy per extensometer specifications.
  • Standard system supports one load and one extensometer input channel. Additional channels are optional. Resolution: 20 bits binary. DSP filter standard. Conversion rate: programmable.
  • Operator-selectable measurement units: English, Metric, SI or mixed.
  • Operator may set any test speed within the capacityof the machine by keyboard entry.
  • Limits programmable-position, load or strain.
  • Cycle functions programmable-position, load or strain control.
  • Area compensation can be turned on or off.
  • Digital servo control system – optical encoder, digital signal processor, solid-state amplifier.
  • Manufactured in the USA

Force Measurement System

Accuracy:  ± the larger of 0.5% of reading or 0.005% of capacity.
Repeatability:  ± the larger of 0.25% of reading or 0.005% of capacity.

Loadframe & Drive System Specifications

Lateral Motion:  ±0.25mm (0.01 inch) maximum over full crosshead travel.
Speed Accuracy:  ±0.1 percent of set speed for all forces within the capacity of the machine when averaged over the larger of 15 seconds or 50mm (2 inches).
Position Resolution:  0.12 µm (5 microinches)
Position Accuracy:  The greater of 0.025mm (0.001 inch) or 0.025% of movement.
Position Repeatability:  ±0.005mm (0.0002 inch).
Drive Resolution:  Same as position resolution.
Frame Stiffness:  5000 lbs. (2262 Kg)/inch deflection.
Speed Range:  0.001” to 40” (1016mm)/min.


Maximum Capacity: 2.5KN (560 lbf)
Crosshead Travel: (excluding load cell & 30” (762mm) fixtures)
Depth to Column: 5” (127mm)

Loadframe Dimensions:

Height:   54” (1371mm)
Width:   12”   (305mm)
Depth:   24”   (610mm)


Loadframe:            150 lb  (68 Kg)
Computer System:  40 lb  (18 Kg)

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