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Front-right angle view of Tekton case micrometer torque wrench. Item #TRQ51502
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Item #TRQ51502

3/8 Inch Drive 90-Tooth Dual-Direction Micrometer Torque Wrench

3/8 IN
20 - 140 Nm

Drive Size

1/4 Inch Drive
3/8 Inch Drive
1/2 Inch Drive

Torque Range

10 - 100 ft-lb
$110
$110.00
Coming Soon

Note: This torque wrench will be available this fall


Drive Size

3/8 in.

Tooth Count / Swing Arc

90-Tooth / 4º

Head Style

Fixed

Torque Range

20 - 140 Nm

Torque Calibration Test Points

20, 84, 140 Nm

Unit Scale

Nm

Minimum Increment

1 Nm

Measuring Direction

Clockwise, Counterclockwise

Torque Accuracy

Within ±3% CW/CCW

Feedback

Mechanical Click

Standards

(meets or exceeds)

ISO 6789-1:2017
ASME B107.300-2021

Effective Length

12.5 - 13.2 in.

Overall Length

15.6 in.

Item Weight

1.79 lb.

Country of Origin

Taiwan

Other Included Items

Download Product Manual
Details

Details

A micrometer torque wrench being used.

Apply Torque with Confidence

Every feature was designed to instill confidence in the wrench's accuracy and control during operation.
  • Calibrated to be accurate within ±3% for both clockwise and counterclockwise directions
  • Certified to the ISO standard for the full listed range (20 - 140 Nm), unlike torque wrenches calibrated to ASME standards, which do not require calibration below 20% of the listed range
  • 90-tooth ratchet head with minimal swing arc (4º per tooth)
  • Accurate micrometer scale with high-contrast markings
  • Locking collar for a positive hold on the target torque setting
  • Coarse handle knurling and centerline groove for a sure grip
Graphic showing ±3% accuracy clockwise or counterclockwise

Accurate Within ±3% for Both Directions

The actual calibration accuracy will be stated on the certificate for your wrench, and will be within ±3%.
Example of maximum expected error:

Graphic showing ±3.3 clockwise and counterclockwise on a torque wrench set to 110 Nm.

Full-Range Calibration Using the ISO Standard

StandardISO
6789-1:2017		ASME
B107.300-2021
Set Points
(Percentages are of maximum torque value)		Lowest Value
60%
100%		20%
60%
100%
Accuracy±4% CW
±4% CCW		±4% CW
±6% CCW
Readings Per Set Point53
Key points of difference highlighted in red

This torque wrench is calibrated to the ISO standard. The ASME standard is more commonly used, but the ISO requirements are stricter in a few key ways:

  • ISO requires the lowest marked value on the scale to be tested. ASME starts testing at 20% of the range, which is often higher than the lowest marked value.
  • ISO requires clockwise and counterclockwise tests to match, whereas ASME allows counterclockwise to be less precise.
  • ISO requires 5 readings for each set point, whereas ASME only requires 3 readings for each.
Because this torque wrench is calibrated to the ISO standard, it also meets and exceeds the ASME standard.
A calibration certificate for a Tekton micrometer torque wrench.

Serialized Certificate of Calibration

A. Matches serial number engraved on the torque wrench

B. Tested from the lowest to highest values

C. Test equipment and conditions

D. Quick summary of calibration tests

E. Five tests for each set point

F. Standard

90-Tooth Fixed Ratchet Head

The single half-moon pawl maintains 9 teeth engaged with the gear at all times, so it won't skip under stress. The internal components are the same design and construction as all of our 90-tooth ratchets.

4º Swing Arc Reduces Length of Travel

Having more teeth in the ratchet (B) results in less travel at the end of the wrench handle (D) between each tooth click.

3/8 Inch Drive (20 - 140 Nm)
#TRQ51502

Tekton 3/8 Inch Drive Micrometer Torque Wrench Illustration – Key to Table Comparing Swing Arcs
A. Overall LengthB. Tooth CountC. Swing ArcD. Length of Travel
15.6 in.90 (Tekton)4°1.09 in.
804.5°1.22 in.
725°1.36 in.
458°2.18 in.
3610°2.72 in.
2415°4.07 in.
Close-up view of the scale on a Tekton micrometer torque wrench compared to a chrome-plated torque wrench.

Easy-to-Read Micrometer Scales

  • Single-unit scale for simplicity (Nm)
  • High-contrast laser markings with bold fonts
  • Satin finish on the body to reduce glare
  • Numbers on the main scale are positioned close to the centerline to be readable without rotating the wrench
  • Indicator lines on the main scale are straight, not offset

Spring-Loaded Collar Locks Your Setting

The collar springs into a locked position that holds your setting and prevents accidental movement during operation. There is no thumb knob to tighten at the end of the handle.
Graphic showing the spring-loaded locking collar.
Close-up view of a Tekton micrometer torque wrench handle

Coarse Knurling for a Secure Grip

A deep, sharp-cut diamond pattern on the surface of the handle creates a coarse texture that won’t slip in your hand.
Cutaway view of a Tekton micrometer torque wrench

Design and Components

Proper Storage: To maintain calibration, store at the lowest setting to relax the adjustment spring.

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Accuracy: Within ±2% Torque, ±1% Angle
Directions: Clockwise, Counterclockwise
Tooth Count: 90 (4º Swing Arc)
Head Style: 15º Flex
Drive Sizes: 3/8, 1/2 in.
Feedback: LCD, Lights, Sounds, Vibration
Units: in-lb, ft-lb, Nm, kg-m


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Micrometer

A Tekton micrometer torque wrench

A single-unit, dual-direction mechanical torque wrench with a high-resolution micrometer scale that’s easy to read and lock in place but requires being set to the minimum value when storing. It's an affordable combination of accuracy and mechanical reliability.

Accuracy: Within ±3%
Directions: Clockwise, Counterclockwise
Tooth Count: 90 (4º Swing Arc)
Head Style: Fixed
Drive Sizes: 1/4, 3/8, 1/2 in.
Feedback: Mechanical Click
Units: in-lb, ft-lb, Nm


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A Tekton split beam torque wrench

A single unit, single-direction mechanical torque wrench that is fast and easy to set and can be stored at any setting because it uses a durable deflecting beam rather than a spring to measure torque. It has a clear, consistent click. It's ideal for users who measure in the usual clockwise tightening direction and make frequent setting changes.

Accuracy: Within ±4%
Directions: Clockwise
Tooth Count: 72 (5º Swing Arc)
Head Style: 10º Flex
Drive Sizes: 3/8, 1/2 in.
Feedback: Mechanical Click
Units: ft-lb, Nm


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