Ring-Forcesensor "SM70": ETH-messtechnik gmbh


Ring force Sensor SM71

For testing clamping forces

Measuring ranges from 20 kN up to 200o kN



  • Available with an inner diameter of 6.5 mm to 43 mm
  • Measuring ranges from 20 kN (M6) up to 2000 kN (M42)
  • Completely made of stainless steel, protection class IP68
  • Short measuring path, very high natural frequency (kHz)
  • Ideal for determining screw preload
  • Extremely flat and robust sensor design
  • Hardened washer included

Short Description

The SM71 series force sensors were specially developed for measuring clamping forces. The short measuring path of 0.019 - 0.14 mm (depending on the measuring range) and a natural frequency in the kHz range guarantee optimal results even for highly dynamic tasks. Typical applications include the simple determination of screw preloads, where the force sensor is used as a “measuring washer”. The very good reproducibility is less than one percent of the nominal load.

The sensor is available in measuring ranges from 20 up to 2000 kN. Hardened washers are already included in the scope of delivery for quick and easy installation. The extremely simple and robust design is made entirely of stainless steel (protection class IP68).

Technical data

Measuring rangeskN20 (M6), 40 (M8), 60 (M10), 100 (M12) , 200 (M16), 300 (M20), 400 (M24), 600 (M30), 1000 (M36), 2000 (M42)
Application area Clamping force measurement

Characteristic value range

mV/V1.7 … 2.3
Operating Temperature °C-10 to+70
Protection class IP68
More Information see data sheet