Universal Testing Machines
ST 250 kN – Universal Testing Machine for High Load Applications
The ST 250 kN universal testing machine from Richard Hess MBV GmbH is designed for precise, standards-compliant material and component testing in the medium to high load range.
Whether in quality assurance, test laboratories, or industrial environments – this robust system stands out through:
- outstanding frame stiffness
- advanced drive technology
- user-friendly test software
The high-performance solution for standardized tensile, compression, bending, and peel tests.
Precise. Versatile. Reliable.
Robust & Flexible Load Frame – For Demanding Testing Tasks
The modular load frame concept of the ST 250 kN ensures maximum stability and flexibility – ideal for frequently changing test setups and various specimen geometries.
Flexibility through modular frame design:
- Equipped with two vertical test spaces as standard, optional lateral test space
- Variable frame heights and widths – adaptable to individual applications
- Easy integration of peripheral devices (e.g. temperature chambers, furnaces, extensometers, optical sensors)
High-Precision Mechanics – For Reliable Results
- Four guide columns and two backlash-free precision ball screws
- Preloaded guides and rugged construction with bellows covers
- Designed for use in demanding production environments
- Brushless AC drive with Harmonic Drive® technology for:
- Precise, low-backlash force transmission
- High testing speeds
- Long-term and cyclic loading applications
Intelligent Control Electronics – For Maximum Accuracy
The ST 250 kN is equipped with cutting-edge adaptive control electronics, offering high system resolution and extensive control options.
Modular control unit with:
- Adaptive controller for dynamic parameter adjustment
- High-resolution signal converters for detailed analysis
- Integrated standard features including:
- Force, displacement, and strain control
- Overload protection
- Automatic sensor identification incl. calibration data
- Specimen break detection
- Return-to-start function
- Manual positioning via test software or optional handheld control device
Safety & Efficiency in Daily Use
- CE-compliant safety enclosure – optional for all machine configurations
- Stable design with vibration-damping feet – no foundation required
- Future-proof & scalable – thanks to modular expandability
Perfectly Matched: Test Software by Richard Hess MBV GmbH
The ST 250 kN is fully compatible with the powerful test software from Richard Hess MBV GmbH:
- Includes all standard modules (tensile, compression, bending, peel)
- Supports both simple and complex test sequences – standard-compliant or customized
- High flexibility in device integration, data import/export, and test sequence configuration
Conclusion:
The ST 250 kN universal testing machine delivers maximum performance, reliability, and flexibility for demanding testing applications in the high-load segment – ideal for today’s needs and tomorrow’s challenges in material testing.
Technical Data – ST 250 kN
| Specification | Value |
|---|---|
| Nominal Load (Main Test Area) | 250 kN |
| Test Area Above Crosshead | 3 kN |
| Mechanical Design | 2 backlash-free precision ball screws, 4 hardened guide columns with spindle protection, AC servo drive |
| Frame Stiffness | 260 kN/mm (including deformation of load cell and adapter) |
| Test Speed | 0.00006 – 600 mm/min (optionally expandable) |
| Crosshead Travel Resolution | < 0.0012 µm |
| Force Measurement Range | 0.1 – 100 % of nominal load, Class 1 (optional Class 0.5), according to DIN EN ISO 7500-1 / ASTM E4 |
| Measurement, Control & Regulation | Integrated force and crosshead channels, 3 free slots (expandable to 7) |
| Data Transmission | Ethernet (LAN) or USB, 50 Hz (standard), higher frequency optional |
| Power Supply | 3P/PE/400 V, 50 Hz (TN system), 4.0 kW, 4 m cable with 16CEE plug on control unit |
| Environmental Conditions | Temperature: 5–40 °C, Humidity: 20–80 % |
| Tool Holder Interface | R60/30 or LK135-12xM12-IG |
| Included in Delivery | Testing machine incl. measurement and control electronics, handheld device with force/displacement display |
| Required for Operation | Load cell, grips/test tools, adapter set, test software, PC (current standard), Windows OS |
Optional Extensions – ST 250 kN
- Temperature control systems (e.g. ovens, climate chambers)
- Extensometers: clip-on, long-travel, optical
- Safety enclosures (CE-compliant)
- Additional test areas: lateral or above the crosshead
- Increased test speed (optional)
Modified crosshead:
- Movable load cell mount (for off-axis testing)
- Multi-load cell setup possible
Accessories:
- T-slot plates, adapters, specimen holders, and more
Dimensions / Weight – ST 250 kN
| Specification | Value |
|---|---|
| H (Total height) | 2150 mm |
| H test (Test space height) | 1200 mm |
| H max (Max. crosshead travel without tools, adapter, or load cell) | 1070 mm |
| B (Width) | 1080 mm |
| B total (Including controller unit) | approx. 1700 mm |
| B test (Test space width) | 610 mm |
| T (Depth) | 700 mm |
| Weight | 1100 kg |
