BF350-3AA 350Ω Constantan Foil Strain Gauge
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Prices updated: 13 Oct 2026
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About this product
A metal-foil resistive strain gauge with a nominal resistance of 350 ohms, used to measure small deformations in a structure or load cell. It is typically wired in a Wheatstone bridge and read through an amplifier, for force, weight and pressure measurement projects.
Specifications
- Nominal resistance
- 350Ω (349.8 ±0.1Ω)
- Grid material
- Constantan foil
- Gauge factor
- 2.00-2.20
- Accuracy class
- 0.02
- Strain limit
- 2.0%
- Fatigue life
- ≥1 million cycles
- Grid size
- 7.1mm x 4.5mm
Frequently asked questions
How do I read this strain gauge with a microcontroller?
A single strain gauge changes resistance very little, so it is usually placed in a Wheatstone bridge with matching resistors, then read through an instrumentation amplifier and an ADC.
How is the gauge attached to the surface being measured?
It is bonded to the surface with a suitable strain gauge adhesive, so that the foil follows the deformation of the part under load.
