Series R51

Universal Torque Sensors

A great solution for general bi-directional torque testing applications requiring different sample sizes. Three interchangeable chuck capacities and bit holder are available. The R51 has superb overload protection and is available in capacities from 10 ozFin to 100 lbFin (7 to 1,150 Ncm).

Requires a Mark-10 indicator, available separately.

  • Member of the Plug & Test® family of interchangeable sensors and indicators
  • Outstanding overload protection
  • Interchangeable chucks (order separately)
  • NIST-traceable certificate of calibration with data is included. If the sensor is ordered with an indicator, a certificate for the set (indicator + sensor) can be supplied upon request, at no additional charge.
  • Warranty: 3 years
  • Accuracy: 
    ± 0.20% of full scale + indicator
  • Weight:
    From 1.4 lb (0.6 kg)
With Model 7i and 5i Indicators
Capacity x Resolution 
Model lbFin ozFin lbFft gFcm kgFmm Nmm Ncm Nm
MR51-10Z 10 x 0.005 700 x 0.5 7 x 0.005 70 x 0.05 7 x 0.005
MR51-20Z 20 x 0.01 1400 x 1 14 x 0.01 140 x 0.1 14 x 0.01
MR51-50Z 50 x 0.02 3600 x 2 36 x 0.02 350 x 0.2 35 x 0.02
MR51-12 12 x 0.005 192 x 0.1 1 x 0.0005 135 x 0.1 1.35 x 0.001
MR51-50 50 x 0.02 800 x 0.5 4 x 0.002 570 x 0.5 5.7 x 0.005
MR51-100 100 x 0.05 1600 x 1 8 x 0.005 1150 x 0.5 11.5 x 0.005
With Model 3i Indicator
Capacity x Resolution 
Model lbFin ozFin kgFmm Ncm
MR51-10Z 10 x 0.01 7 x 0.005 7 x 0.005
MR51-20Z 20 x 0.02 14 x 0.01 14 x 0.01
MR51-50Z 50 x 0.05 36 x 0.05 36 x 0.05
MR51-12 12 x 0.01 192 x 0.2 135 x 0.1
MR51-50 50 x 0.05 800 x 1 570 x 0.5
MR51-100 100 x 0.1 1600 x 2 1150 x 1
IN [MM]
Model Description US Price
MR51-10Z Torque sensor, 10 ozFin / 700 gFcm / 7 kgFmm / 70 Nmm / 7 Ncm $795.00
MR51-20Z Torque sensor, 20 ozFin / 1400 gFcm / 14 kgFmm / 140 Nmm / 14 Ncm $795.00
MR51-50Z Torque sensor, 50 ozFin / 3600 gFcm / 36 kgFmm / 350 Nmm / 35 Ncm $795.00
MR51-12 Torque sensor, 12 lbFin / 1 lbFft / 192 ozFin / 135 Ncm / 1.35 Nm $745.00
MR51-50 Torque sensor, 50 lbFin / 4 lbFft / 800 ozFin / 570 Ncm / 5.7 Nm $745.00
MR51-100 Torque sensor, 100 lbFin / 8 lbFft / 1600 ozFin / 1150 Ncm / 11.5 Nm $745.00
G1016-1 Jacobs chuck for R51, 0.028”-0.25” dia. $135.00
G1016-2 * Jacobs chuck for R51, 0.062”-0.375” dia. $140.00
G1016-3 * Jacobs chuck for R51, 0.078”-0.5” dia. $145.00
G1017 Bit holder for 1/4” hex, for R51 $145.00
20-1025 Chuck key, for 1/2” Jacobs chucks, size KK $10.00
20-1025-1 Chuck key, for 1/4” & 3/8” Jacobs chucks, size KGA $10.00

* Due to the increased possibility of overload resulting from a higher weight attachment used with a lower capacity torque sensor, these attachments are recommended for use only with an MR51-12 or higher capacity model.