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Rotary peak torque measuring equipment

ST3(-BT) / ST3-G(-BT)

RoHS markingSocket insertion part□6.35Socket insertion part□9.53Socket insertion part□12.7Socket insertion part□19.05Socket insertion part□25.4



Rotary Type

Direct Reading


ST3 is available in SI units in Japan. ST3-G CPT-G series products are manufactured for the global market and offer a selection of SI, metric and American units of measurement.

Spintork® ST15N3-6.35 (L' = 106.5[mm])

Spintork® ST50N3-3/8 (L' = 75[mm])

Spintork® ST1000N3-BT (L' = 135[mm])

Example of a multi-spindle device in use


  • Checks nutrunner torque and angle on multi-spindle tightening equipment.
  • The ST3-BT and ST3-G-BT series are especially useful for checking torque and angle for rotation angle tightening into the plastic range.
  • Often used to good effect as a measuring device (standard accessory) for multi-spindle equipment nutrunners.
  • Checks the torque and angle of angle power tools and hand nutrunners.
  • The ST1000N3 is ideal for torque checking (routine inspections) of TW2 series torque wrenches used to tighten the wheel nuts of large vehicles, and the DQLE1000N2 torque wrench.


  • Digital torque checkers. The world’s most compact rechargeable rotary torque measuring equipment. (Patented)
  • Nutrunner torque checks (routine inspections) can prevent the production of imperfectly tightened items.
  • Lets operators perform torque checks (routine inspections) of multi-spindle tightening equipment while tightening at the same time. Connecting the optional extension bar, which has the same length as the ST3, to spindles not installed with Spintork® makes it easy to check torque without removing the nutrunner from multi-spindle tightening equipment. This reduces steps in the manufacturing process.
  • Nutrunner inline measurement is possible. If the model is Bluetooth® equipped, torque checking can be cordless, improving workability.
  • ST3 and ST3-G are equipped with an angle sensor. If tightening is done with a handheld nutrunner attached to the ST3 or ST3-G, torque checking and angle checking can be done at the same time as tightening operations. (* Note: Angle measurements are measurements from set snug torque values.)
  • When the supplied USB connecting cable is connected to a PC, tightening torque and angle data determined through measurements using a ST3 or ST3-G SpinTork Rotary Peak Torque Meter can be spread and controlled in Excel format using ExRcv for ST3. (ExRcv for ST3 is available for downloading free of charge.)
  • The ST3-BT and ST3-G-BT can be used to create torque and angle graphs. With a Bluetooth®-equipped ST3-BT, torque and angle can be measured and recorded continuously, and tightened-to-completion data is transmitted wirelessly to a PC. Then after ExRcv for ST3 spreads the data on an Excel file, graphs displaying tightening torque and angle values can be created. (* Note: You need to have your own software for Bluetooth® signal reception.) (* Note: When the ST3 is not the -BT version, memory stores only angle data at time of recording and maximum torque, and graphs cannot be created.)
  • Bit types and small square drive models have been added to the lineup. Newly added: ST15N3-6.35, which can be attached to Hex 6.35 bit tools (not available on older ST2 series), and ST50N3-3/8 9.53 square drive (smaller than previous version).
  • Excel Receiver software is a data input tool for Excel® data management. It can be downloaded for free. * Note: Excel® is a registered trademark of the Microsoft Corporation.
  • A Tightening Data Management System can be created for Bluetooth-equipped ST3-BT / ST3-G-BT series devices, through use of the special custom-modified TDMS / TDMSHT.
  • ST3-BT/ST3-G-BT conform to telecommunication standards in Japan, the U.S., Canada, the EU, Thailand, Mexico, Vietnam, Brazil, Taiwan, China, Singapore, South Korea, Russia, and Malaysia (information valid as of September 2019).

Demonstration video

Spintork®, the digital torque checker for ST3 nutrunners


MODEL ST10N3-G ST15N3-6.35-G ST20N3 ST50N3-3/8 ST50N3-1/2 ST100N3 ST200N3 ST500N3 ST1000N3
Bluetooth(R) ST10N3-G-BT ST15N3-6.35-G-BT ST20N3-BT ST50N3-3/8-BT ST50N3-1/2-BT ST100N3-BT ST200N3-BT ST500N3-BT ST1000N3-BT
MIN.~MAX. 2~10 4~15 4~20 10~50 20~100 40~200 100~500 200~1000
1DIGHT 0.01 0.02 0.05 0.1 0.2 0.5 1
MIN.~MAX. 200~1000 400~1500 400~2000 1000~5000
1DIGHT 1 2 5
MIN.~MAX. 20~100 40~150 40~200 100~500 200~1000 400~2000 1000~5000
1DIGHT 0.1 0.2 0.5 1 2 5
MIN.~MAX. 0.2~1 0.4~1.5 0.4~2 1~5 2~10 4~20 10~50 20~100
1DIGHT 0.001 0.002 0.005 0.01 0.02 0.05 0.1
MIN.~MAX. 17.6~88 35~132 35~175 88~440 176~880 350~1750 880~4400
1DIGHT 0.1 0.2 0.5 1 2 5
MIN.~MAX. 1.5~7.3 3~11 3~14.5 7.5~36.5 15~73 30~145 75~365 150~735
1DIGHT 0.01 0.02 0.05 0.1 0.2 0.5 1
MIN.~MAX. 285~1400 560~2100 560~2800 1400~7000
1DIGHT 1 2 5
L’ 75 106.5 75 120 135
46(50) 68.5
49 73
ΦD 13 18 27 38 51
□a 6.35 9.53 12.7 19.05 25.4
Φd1 2.1 3.1 4.1 6 6.5
Φd2 2.1 5 6 6.5
53 78
50(52) 71
WEIGHT[kg] 0.25 1.3
                  Torque Accuracy ±1%+1dight
Angle Measurement Range 0 to 999º   ST3-G-BT Communication Specifications
Angle Accuracy ±2º + 1 digit (when rotated by 90º at 30º/sec. to 600º/sec.)   Communication System Bluetooth(R)
Direction Right and left   Wireless Communication Distance 10m
Display 7-segment LCD display
Memory count value: 3 digits (character height: 3 mm),
Torque/rotating angle display: 4 digits(character height: 7 mm)
Unit, Remaining battery capacity, Measuring direction
  Continuous Operating Time BT off : Approx. 10 hours
BT on : Approx. 8 hours
Measurement Mode PEAK/RUN          
Data Memory 999          
Arithmetic Function Number of samples, maximum, minimum and average values          
Power Nickel hydrogen battery pack          
Continuous Operating Hours Approx. 10 hours ( BT off : Approx. 10 hours )          
Charger Input: 100 to 240 V AC ± 10% (conforming to PSE, compliant with CE)          
Charging Time Approx. 2 hours          
Operating Temperature Range 0 to 40ºC          
  • The Spintork® ST3 series cannot be used when connected to an impact wrench. (Damage to electronic parts could cause equipment failure and inaccuracy.)

  • Japan’s Measurement Law prohibits ST3-G / ST3-G-BT series devices from being used in Japan or sold for use in Japan.


Standard accessory

Quick battery charger BC-4-2, power source conversion plug, power source plug for long-term storage, carrying case, instruction manual, USB connecting cable (No.384; not supplied for –BT models), calibration certificate




◆ How to order

[Tohnichi] [Model] Please specify.

[Example 1] Tohnichi ST100N3

[Example 2] Tohnichi ST15N3-6.35-BT ※For Bluetooth® models, -BT will be appended at the end of model name.

◆ Things to remember when ordering

Cannot be used with impact wrench.


Product Catalog

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Parts List

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Online Part Search System
How to Use
[September 2019 Version] Tohnichi’s Torque Engineering Seminars, ready to provide positive results in the workplace right away.

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Technical Data
4. Tightening Reliability

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6. Torque Tools are Measurement Equipment

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9. Standards and Limitations

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[September 2019 Version] Everything from torque controls to Tohnichi’s Tightening Guarantee System

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