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R55 Series robust Square Drive Torque Sensor

Made in the USAThe versatile R55 Series torque sensors are developed for inline use with square drives on both ends. It comes in a range of 6 capacities up to 550 Nm.

With a female square on the bottom and a male square on top in a range from ¼” to ¾” this sensor fits a torque wrench for inline measurements and can be used in combination with an optional AC1010 tabletop mounting kit to use it for calibration purposes.

The rugged setup and limited size of the R55 make it suitable for multiple applications from laboratory and industrial to field service use and for calibrating torque tools to using a standard socket wrench as a precise torque wrench.

An R55 sensor requires an I3, I5 or I7 indicator (sold separately) and is part of the Plug & Test® system family. Sensors with Plug & Test®  store calibration and configuration data in its internal PCB, this provides the opportunity to calibrate and configure sensors and use them on any I series indicator without re-calibration or re-configuration.

Delivery includes a certificate of calibration which contains 10 data points in each measuring direction.

We are happy to assist you in finding the most suitable configuration for your needs. Please contact us for more information.  

  • Compatible with the 7i, 5i and 3i digital indicators
  • NIST-traceable certificate of calibration included
  • Square drives on each end
  • Stainless steel and aluminum construction
  • Unique Plug & TestTM connector holds all calibration and configuration data
  • Rugged cylindrical design

Plug &Test® Smart Force & Torque Sensors

General information

Mark-10 M7I, M5I, and M3I indicators are used in combination with Plug & Test® sensors and can therefore accommodate numerous force and torque measurement requirements, from 1 N to 50 kN (0.25 to 10,000 lbF) of force, and from 7 Ncm to 550 Nm (10 ozFin to 5,000 lbFin) of torque.

Plug & Test® sensors can be used handheld or mounted to a fixture or test stand for more accurate and repeatable testing results.
The sensors are separately calibrated therefore they can be disconnected from one indicator and connected to another without the need for re-calibration or re-configuration as this is stored in the PCB located inside the smart connector.


System accuracy is determined by the combination of Indicator and sensor combined. To determine the total system accuracy the accuracy value of the sensor is added to the value of the indicator.
As the Indicators have different accuracy values the total system accuracy may vary between the different indicator/sensor combinations. Indicator Model Accuracy M7I / M5I ±0,1% of full scale M3I ±0,2% of full scale.

Example 1 Model MR01-100 sensor with Model M5I Indicator MR01-100 ±0,15% of full scale + M5I ±0,1% of full scale = Total ±0,25% of full scale This translates into a fixed error of up to: 0,25% x 500 N = 1,25 N

Example 2 Model MR50-50Z sensor with Model M3I Indicator MR50-50Z ±0,35% of full scale + M3I ±0,2% of full scale = Total ±0,55% of full scale This translates into a fixed error of up to: 0,55% x 50 Ncm = 0,275 Ncm

Because accuracy is defined as a percentage of full scale, the fixed error is possible anywhere on the scale from 0 to the capacity. As such, this value represents an increasingly large error as percentage of reading towards the low end of the scale. It is, therefore, recommended that a sensor is selected with capacity as close as possible to the expected load. The resolution may be different for some sensors depending on whether a M7I, M5I, or M3I indicator is being used. For example, a Series R01 force sensor will display finer resolution when connected to a M5I indicator than when connected to a M3I indicator.

Dimensions-R55 Series

R55 dimensions
ModelDrive SizeABCDØEF
MR55-201/4"0,30 [7,5]1,73 [44,0]0,32 [8,0]0,39 [10,0]1,77 [45,0]2,32 [59,0]
MR55-501/4"0,30 [7,5]1,73 [44,0]0,32 [8,0]0,39 [10,0]1,77 [45,0]2,32 [59,0]
MR55-1001/4"0,30 [7,5]1,73 [44,0]0,32 [8,0]0,39 [10,0]1,77 [45,0]2,32 [59,0]
MR55-2003/8"0,41 [10,5]1,73 [44,0]0,43 [11,0]0,39 [10,0]1,77 [45,0]2,32 [59,0]
MR55-4003/8"0,41 [10,5]1,73 [44,0]0,43 [11,0]0,39 [10,0]1,77 [45,0]2,32 [59,0]
MR55-10001/2"0,59 [15,0]1,73 [44,0]0,63 [16,0]0,39 [10,0]1,77 [45,0]2,32 [59,0]
MR55-50003/4"0,89 [22,5]2,11 [53,5]0,94 [24,0]0,77 [19,5]2,01 [51,0]2,56 [65,0]
All sizes are in inch with [mm] behind

Capacity x Resolution with Model 7i and 5i Indicators
MR55-202 x 0,002220 x 0,2-1,5 x 0,002320 x 0,220 x 0,02
MR55-505,7 x 0,005570 x 0,5-4 x 0,005800 x 0,550 x 0,05
MR55-10011,5 x 0,011150 x 1-8 x 0,011600 x 1100 x 0,1
MR55-20022 x 0,022200 x 22300 x 216 x 0,02-200 x 0,2
MR55-40045 x 0,054500 x 54600 x 532 x 0,05-400 x 0,5
MR55-1000110 x 0,111000 x 1011500 x 1080 x 0,1-1000 x 1
MR55-5000550 x 0,555000 x 5055 x 0,05 kgFm400 x 0,5-5000 x 5

Capacity x Resolution with Model 3i Indicators
MR55-20220 x 0,2-320 x 0,520 x 0,02
MR55-50570 x 0,5-800 x 150 x 0,05
MR55-1001150 x 1-1600 x 2100 x 0,1
MR55-2002200 x 22300 x 2-200 x 0,2
MR55-4004500 x 54600 x 5-400 x 0,5
MR55-100011000 x 1011500 x 10-1000 x 1
MR55-5000550 x 0.5 Nm55 x 0.05 kgFm-5000 x 5


Cic-Torque Torque Instrument Calibration

  • Short turnaround
  • Easy planning of calibration

More details

Cic-Torque Torque Instrument Calibration 127043

Category Mark-10 Attachments

More details

Category  Mark-10 Attachments 0

Accuracy± 0.6% of full scale + indicator
Weightfrom 0.6 kg to 0.9 kg
Shipping weightMR55-20 – MR55-1000: 1.4 kg
MR55-5000: 1.8 kg
Warranty3 years

Related Products

Series-3I Force/Torque Indicator

  • Interchangeable force and torque sensors through Plug & Test® technology (sensors are sold separately)
  • High-speed 2.000 Hz sampling rate
  • Ultra-compact size

More details

Series-3I Force/Torque Indicator

Series-5I Advanced Digital Force/Torque Indicator

  • Interchangeable force and torque sensors through, separately sold, Plug & Test® technology
  • High-speed 7.000 Hz sampling rate
  • USB, RS-232, Mitutoyo, and analog outputs

More details

Series-5I Advanced Digital Force/Torque Indicator

Series-7I Advanced Force/Torque Indicator

  • Interchangeable force and torque sensors through Plug & Test® technology (sensors are sold separately)
  • High-speed 14.000 Hz sampling rate
  • Continous data capture of up to 5.000 data points, at up to 14.000 Hz, downloadable to a PC
  • 5 units of measurement, plus Coefficient of Friction and user-defined unit with configurable name

More details

Series-7I Advanced Force/Torque Indicator


Buy Now

MR55-20 - Torque Sensor - 220 Ncm
€ 1.326,00 
MR55-50 - Torque Sensor - 570 Ncm
€ 1.326,00 
MR55-100 - Torque Sensor - 1150 Ncm
€ 1.326,00 
MR55-200 - Torque Sensor - 2200 Ncm
€ 1.326,00 
MR55-400 - Torque Sensor - 4500 Ncm
€ 1.326,00 
MR55-1000 - Torque Sensor - 11000 Ncm
€ 1.326,00 
MR55-5000 - Torque Sensor - 55000 Ncm
€ 1.326,00 

AC1010 Mounting kit, MR55-200/400, table top
€ 121,00 
AC1016 Mounting kit, MR55-200/400, to Series TST stands
€ 72,00 
All mentioned prices are excluding VAT & excluding shipment costs.
Availability: Available: 1 - 3 days, Delivery time: 1 - 3 weeks, special order request

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