• High stiffness / Minimal deflection
  • Deflection is 100% translational
  • Resistant to sideloads and force vectors
  • High thermal stability
  • Fatigue rated
  • Standard 2 year warranty

F331 Fatigue Rated, High Stiffness, Low Range Loadcell

The F331 low range loadcell has been developed to meet a growing need for high resolution, low range force measurement with minimal translational deflection. The high stiffness of these loadcells, combined with their robust construction, lends themselves particularly well to dynamic and/or fatigue applications.

The minimum fatigue life of 108 fully reversed RL cycles can be greatly extended if the cycles occur below full rated load.

Both the F328 and F329 loadcell product types offer excellent performance but rely on a comparatively low stiffness strain mechanism. The F329 in particular requires a reduced output sensitivity in order to maintain some level of robustness. The F331 on the other hand offers some advantages over both and also benefits from a purely mechanical resistance to sideloads and vectors. Sideloads up to 25% RL can be withstood for as little as 2% RL error. Similarly, misalignment of up to 3° swept 360° around the measurement axis typically yields no more than 1% RL error.

The strain section within the housing is a separate monocoque structure, allowing repairs to be made quickly and cheaply in comparison to other low range loadcells. Other housing designs and fixing arrangements are therefore possible. The F330 offers the same ranges and performance in a circular housing.

We are happy to design variants of this loadcell to meet your specific requirements. Please consult our engineering department.

Details of our other loadcell families can be found in the Product Guide.

Ordering Codes

See the loadcell ordering code sheet for more details. Add range in the required force units.
F331CF00H0 Compression, unrationalised F331CF00HN Compression, unrationalised
F331TF00H0 Tension, unrationalised F331TF00HN Tension, IP65, rationalised
F331UF00H0 Bi-directional, unrationalised F331UF00HN Bi-directional, rationalised

F331 Specification

Parameter Value Unit
Non-linearity - Terminal ±0.2 % RL
Hysteresis ±0.1 % RL
Creep - 20 minutes ±0.2 % AL
Repeatability ±0.02 % RL
Rated output - Nominal 0.6 mV/V
Rated output - Rationalised 0.5 mV/V
Rationalisation tolerance (applies to single direction calibrations) ±0.5 % RL
Output symmetry ±1.0 % AO
Fatigue Life 108 RL cycles
Zero load output ±10 % RL
Temperature effect on rated output per °C ±0.005 % AL
Temperature effect on zero load output per °C ±0.02 % RL
Temperature range - Compensated -10 to +50 °C
Temperature range - Safe -10 to +80 °C
Excitation voltage - Recommended 10 V
Excitation voltage - Maximum 10 V
Bridge resistance 350 Ω
Insulation resistance - Minimum at 50Vdc 500
Overload - Safe 50 % RL
Overload - Ultimate 100 % RL
Weight - Nominal (excluding cable) 35 g

All standard ranges are manufactured in aluminium.

Structural stiffness - Nominal

Range (N) Stiffness (N/m) Range (N) Stiffness (N/m) Range (N) Stiffness (N/m)
0.5 1.0 x 105 5 5.0 x 105    
1 2.0 x 105 10 8.3 x 105    
2.5 3.2 x 105 20 1.3 x 106    


  1. AL = Applied load.
  2. RL = Rated load.
  3. Temperature coefficients apply over the compensated range.
  4. AO = Average of tension and compression outputs for full load.


The loadcell is fitted with 2 metres of PVC insulated 4 core screened cable type 7-1-4C.

Excitation + = Red, Excitation - = Blue, Signal + = Yellow, Signal - = Green, Screen = Orange.

Reverse the signal connections to obtain a positive signal in tension mode. The screen is not connected to the loadcell body.

Additional Information

Outline Outline drawing of the product.
STEP file STEP files for standard ranges.
Stock List Loadcell availability.
PDF data-sheet Printable data-sheet. Right click on the link to download the file.