• Tension / compression / bi-directional calibration
  • Easy installation
  • Standard 2 year warranty
  • Sealed to IP65
  • Hardened stainless steel body
  • Traceable calibration with certificate included in the standard price

F251 Miniature Diaphragm Loadcell

Geometry: Very small loadbutton cell for force measurement in confined spaces. Used in compression and/or tension on a wide range of OEM or end-user applications.

With bi-directional versions there is a small difference between the output signal for compression and tension. All standard bi-directional loadcells are calibrated in both modes and the output for each direction is stated on the test / calibration certificate.

The F251 is ideally suited to force measurements in confined spaces in both tension and compression for control of critical parameters in all kinds of industrial processes. Their versatility is such that they are also applied in a great number of important fields of scientific and engineering test work, mobile as well as workshop, static and dynamic.

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.
F251CFR0H0 Compression, IP65, unrationalised F251CFR0HN Compression, IP65, rationalised
F251TFR0H0 Tension, IP65, unrationalised F251TFR0HN Tension, IP65, rationalised
F251UFR0H0 Bi-directional, IP65, unrationalised F251UFR0HN Bi-directional, IP65, rationalised
Change the C to a D for compression with thread fitting.

F251 Specification

Parameter Value Unit
Non-linearity - Terminal ±0.5 % RL
Hysteresis ±0.5 % RL
Creep - 20 minutes ±0.1 % AL
Repeatability ±0.1 % RL
Rated output - Nominal 1.6 mV/V
Rated output - Rationalised 1.0 mV/V
Rationalisation tolerance (applies to single direction calibrations) ±0.5 % RL
Zero load output ±4 % RL
Temperature effect on rated output per °C ±0.005 % AL
Temperature effect on zero load output per °C ±0.03 % 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
Sealing IP65  
Weight - Nominal (excluding cable) 8 to 11 g

Ranges up to 200N (20kgf) are manufactured in aluminium. All other standard ranges are stainless steel.

Structural stiffness - Nominal

Range (N) Stiffness (N/m) Range (N) Stiffness (N/m) Range (kN) Stiffness (N/m)
100 3.7 x 106 400 1.5 x 107 1.6 6.0 x 107
200 7.3 x 106 800 3.0 x 107 3.2 1.2 x 108


  1. AL = Applied load.
  2. RL = Rated load.
  3. Temperature coefficients apply over the compensated range.
  4. The load must be applied directly through the central loading axis.


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.

When this loadcell is rationalised the resistors are housed in a capsule located in the loadcell cable 100mm from the free end. Capsule dimensions are Ø10mm by 57mm.

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.