Phone: 719.694.8040
Fax:   888.809.3867




Model ETB is designed specifically for measuring yield and the low strain measurements typically found in proof testing bolts and similar samples.

The standard configuration allows testing bolt lengths from 25 mm (1.000") to 150 mm (6.000"). For testing longer bolts, extension beams are readily available.

Model ETB is easily attached to a sample via two replaceable, carbide conical points. It is designed to be self-supported and attach without the need of punch or centering marks.  The lower attachment arm assembly includes a zero adjustment thumb screw and a "break-away" lower attachment arm to prevent damage in the event of bolt failure.

Designed around our innovative and rugged crossed-flexure module, this model also features a durable, one-piece upper mount with built-in mechanical stops to ensure a long service life.

With a full bridge, 350 ohm, strain gaged design, model ETB is compatible with most test systems and signal conditioning electronics design for strain gage based transducers. Reliant can provide stand-alone electronics to allow the use of data acquisition boards (DAQ), chart recorders or other test equipment.

  • May be used through specimen failure.
  • 350 ohm, full bridge strain gaged design to ensure compatibility with most any test system.
  • Designed for general measurement of displacement and cyclic / dynamic testing.
  • Built-in mechanical over-travel stops and a break-away lower arm.
  • Rugged, optimized, dual flexure design for strength and improved performance.
  • Meets ASTM E83 and ISO 9513 standards.
  • High and low temperature options extend operation range from -270°C to +200 °C (-454 °F to +400 °F).
  • Connectors to interface to nearly any brand of test equipment.
  • Gage length extension beams available for testing bolts greater than 150 mm (6.000") long.
  • Stand alone signal conditioners for use with DAQ boards.

Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max.

Output: 2 to 4 mV/V, nominal.

Linearity: ≤0.15% of full scale measuring range.

Standard Temp. Range: -40 °C to +100 °C (-40 °F to 210 °F) (optional temperature ranges available)

Cable: Standard 2.5 m (8 ft), ultra-flexible cable.

Quick Mounting System: Replaceable tungsten carbide conical tips eliminate the need for center / punch marks.

Operating Force: Typically less than 50 g.

If you have any questions, please call or click request button below.

Bolt Proof Extensometer - Model ETB

Designed specifically for measuring yield and the low strain measurements typically found in proof testing bolts and similar samples. Full scale measuring ranges of 1.25 mm or 0.050" and temperature ranges from -270 °C to 200 °C.

Robust, Cross-Flexure Design

optimized for high linearity, performance, and ruggedness


ASTM E83 and ISO 9513

designed and verified to meet current standards


Over 10 Years Serving the Industry

we will be there with service and support when you need it


Our model ETB bolt test extensometer is built with a modular design. This allows us to supply the exact measuring range and temperature range required for your test. Extension beams are also available for testing bolts longer than 150 mm (6.000").  Please contact us if your particular configuration is not listed.

Ordering Information: Model ETB-____-_
Measuring Range:
Temperature Range:


125M = 1.25 mm

050T = 0.050"

S = -40 °C to +100 °C

L = -270 °C to +100 °C

H = -40 °C to +200 °C

X = -270 °C to +200 °C

Model ETB is available in any configuration of measuring range and temperature range listed above. Other configurations are available; please contact Reliant with your requirements.

Example: ETB-125M-X

(1.25 mm measuring range, and extended temperature option)

Reliant Technology LLC.

2334 E Boulder Street

Colorado Springs, CO 80909 USA


Questions or Repair?

If you have any questions or would like a quote, please contact us HERE.

If your extensometer is in need of service or repair, please fill out an RMA form HERE.