KV Series
Crack Gages

  • RoHS


Bonded to the cracked part of a structure or material (or a part of such material where a crack is predicted to develop), the KV series gages measure the developing length and velocity of the crack.
Different from usual strain gages, the grids of the KV series gages are cut along with crack development, resulting in resistance change.


• Progress and developing velocity of the crack are electrically obtained.
• Applicable to both flat and curved surfaces.
• Resistance change vs crack length is virtually linear.
• Dedicated adapter enables use of a conventional strain amplifier.
• Extremely simple and convenient compared with the conventional optical method.
• Allows 2 trigger wires each in front of and behind the grid (KV-5C) to be used for automation of measurement.

Major Properties

Materials Resistive element CuNi alloy foil
Materials Base Paper base + phenol-epoxy
Operating temperature in combination with major adhesives after curing (°C) CC-33A
Operating temperature in combination with major leadwire cables (°C)
Self-temperature-compensation (°C)
Applicable linear expansion coefficients (×10-6/℃)
Strain limits at normal temp. (approx. %)
Fatigue lives at normal temp. (times)

Products table

All display

KV Crack Gages

  • RoHS

5 gages/pkg

Model Dimensions (mm)
Gage(Grid) Base
Length Width Length Width
KV-5C 30 5
KV-25B 42 32

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Applicable Adhesives: CC-33A, CC-36, PC-600
Adapter:       KVA-1A (Optional accessories)
Dimensions:      35 x 20 x 15 mm