Phone: 719.694.8040
Fax:   888.809.3867




Our model EAG axial extensometer is designed around our innovative, cross-flexure module. This extensometer is designed for improved performance and ruggedness. It features a side-exit cable to reduce cable wear / damage.

Model EAG also features our unique, ultra-low profile, axial Quick Attach System allowing easy, one-handed, specimen attachment even between very close grips. This attachment system is designed to provide easy attachment while not influencing the extensometer's output or performance. The wire forms on our system are designed to transmit the attachment force axially through the extensometer body.

The Quick Attach System includes round and flat wire forms for both round and flat specimens. If you prefer to attach the extensometer with springs or rubber bands, spring mounts are available.

With a full bridge, 350 ohm, strain gaged design, model EAG 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 left on through specimen failure.
  • 350 ohm, full bridge strain gaged design to ensure compatibility with most any test system.
  • Designed to measure in both tension and compression and can be used for cyclic testing.
  • Built-in mechanical over-travel stops provide protection in both directions.
  • Low profile Quick Attach System allows one hand mounting to specimens in tight spaces.
  • Standard units meet ASTM class B-1 requirements for accuracy and a verification certificate is included with each unit.
  • Rugged, optimized, dual flexure design for strength and improved performance.
  • Low friction cable stop design does not influence performance.
  • Replaceable, tool steel knife edges and all units are shipped with a spare set.
  • Solid, replaceable arms are not easily damaged like other designs.
  • 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.
  • Custom wire-forms available for attachment to large specimens.
  • Gauge length adapter kits.
  • Stand alone signal conditioners for use with DAQ boards.
  • High-Toughness, and specialty knife edges.

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 Attach System: Fits round samples up to 25 mm (1.000") diameter and flat samples up to 12.5 mm thick by 32 mm wide (0.500" by 1.250"). (optional wire forms available for larger specimens)

Operating Force: Typically less than 30 g.

Additional Views

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

Axial Extensometer - Model EAG

General purpose, strain gage based extensometers for axial tensile, compression, and cyclic testing. Gauge lengths from 10 mm to 250 mm (0.400" to 10.000"), full scale measuring ranges from 5% to 100% strain, 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 EAG axial extensometer is built with a modular design. This allows us to supply the exact gauge length, measuring range, and temperature range required for your test. For compression testing of composites, such as ASTM D695, model EAG extensometers can be configured to directly mount onto compression fixtures. Please contact us if your particular configuration is not listed.

Ordering Information: Model EAG-____-____-_
Gauge Length:
Measuring Range:
Temperature Range:


010M = 10 mm

012M = 12 mm

015M = 15 mm

025M = 25 mm

050M = 50 mm

075M = 75 mm

080M = 80 mm

100M = 100 mm

200M = 200 mm

250M = 250 mm

0040 = 0.400 in

0050 = 0.500 in

0064 = 0.640 in

0100 = 1.000 in

0140 = 1.400 in

0200 = 2.000 in

0400 = 4.000 in

0800 = 8.000 in

1000 = 10.000 in

0050 = ±5%

0063 = +6.25% / -3.125%

0100 = ±10%

0200 = +20% / -10%

0250 = +25% / -10%

0500 = +50% / -10%

1000 = +100% / -5%

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 EAG is available in almost any configuration of gauge length, measuring range and temperature range listed above. Other configurations are available; please contact Reliant with your requirements.

Example: EAG-025M-0100-S

(25 mm gauge length, ±10% measuring range, and standard 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.