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Front-right angle view of Tekton case torque wrench. Item #TRQ52403
Back angle view of Tekton case micrometer torque wrench. Item #TRQ52403
Side view of Tekton case torque wrench. Item #TRQ52403
Front view of Tekton case micrometer torque wrench. Item #TRQ52403
Second side view of Tekton case torque wrench. Item #TRQ52403
Person holding Tekton case micrometer torque wrench. Item #TRQ52403
Laid out contents of Tekton case micrometer torque wrench. Item #TRQ52403
Laid out contents of Tekton case micrometer torque wrench. Item #TRQ52402
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Item #TRQ52403

1/2 Inch Drive 90-Tooth Dual-Direction Micrometer Torque Wrench

40 - 300 ft-lb
•

Drive Size

1/4 in.
3/8 in.
1/2 in.

Torque Range

40 - 200 ft-lb
$125
40 - 300 ft-lb
$150
$150.00
Add to Cart
Drive Size

1/2 in.

Tooth Count / Swing Arc

90-Tooth / 4º

Head Style

Fixed

Torque Range

40 - 300 ft-lb

Torque Calibration Test Points

40, 180, 300 ft-lb

Unit Scale

ft-lb

Minimum Increment

2 ft-lb

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

Working Length

22.5 - 23.2 in.

Overall Length

26.1 in.

Item Weight

3.59 lb.

Country of Origin

Taiwan

Other Included Items

Download Product Manual

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DetailsSpecifications

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 (40 - 300 ft-lb), 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 ±7.5 clockwise and counterclockwise on a torque wrench set to 250 ft-lb.

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.

1/2 Inch Drive (40 - 300 ft-lb)
#TRQ52403

Tekton 1/2 Inch Drive Micrometer Torque Wrench Illustration – Key to Table Comparing Swing Arcs
A. Overall LengthB. Tooth CountC. Swing ArcD. Length of Travel
26.1 in.90 (Tekton)4°1.82 in.
804.5°2.05 in.
725°2.28 in.
458°3.64 in.
3610°4.55 in.
2415°6.81 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 (ft-lb)
  • 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.
The case has hard plastic latches, a product manual and certificate of calibration, removable metal hinge pins, and additional accessories.

Full-Featured Case

The case provides safe transport for the torque wrench and protects it from drops. Each item in the case has its own place and is held securely.

The case is made of high-density polyethylene (HDPE), and the latches are polypropylene (PP).

With the lid off, the case and wrench are 2.3 inches tall.

Removable Lid for Shallow Drawers

Graphic pointing out the tracks on the top and bottom of the case.

Top and Bottom Tracks Allow Stacking

Hand holding a black torque wrench case.

Textured Surfaces Provide a Firm Grip

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Electronic

A multi-unit, dual-direction electronic torque wrench that can measure torque and angle. The large LCD screen provides real-time feedback along with lights, sounds, and vibration. It stores 10 custom presets and the last 50 history records. It’s our most capable and accurate torque wrench.



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 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
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Split Beam

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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Specifications

1/2 Inch Drive 90-Tooth Dual-Direction Micrometer Torque Wrench (40 - 300 ft-lb)

Country of Origin
Taiwan
Item Weight
3.59 lb.