Home/Torque Wrenches/Micrometer Torque Wrenches

New Release

TEKTON 1/4 Inch Drive Dual-Direction Micrometer Torque Wrench (20 - 200 in-lb)

Side view of Tekton torque wrench set. Item #TRQ50402

Second side view of Tekton torque wrench set. Item #TRQ50402

Tap Click image to zoom in

Item #TRQ50402

1/4 Inch Drive Dual-Direction Micrometer Torque Wrench

•

Drive Size

1/4 in.

3/8 in.

1/2 in.

Torque Range

20 - 200 in-lb

$85

$85.00

Drive Size	1/4 in.
Tooth Count / Swing Arc	90-Tooth / 4º
Head Style	Fixed
Listed Torque Range	20 - 200 in-lb
Calibrated Working Range	20 - 200 in-lb
Unit Scale	in-lb
Minimum Increment	1 in-lb
Measuring Direction	Clockwise / Counterclockwise
Accuracy	±3% CW, ±3% CCW
Target Torque Feedback	Mechanical Click
Standards (meets or exceeds)	ISO 6789-1:2017 ASME B107.300-2021
Working Length	7.7 - 8.4 in.
Overall Length	10.1 in.
Item Weight	0.73 lb.
Country of Origin	Taiwan
Other Included Items	Case Product Manual Certificate of Calibration 1/4 Inch Drive Hex Bit Holder 1/4 to 3/8 Inch Drive Adapter

Download Product Manual

Need to recertify your wrench’s calibration?
We are developing a recertification service for this torque wrench. Please subscribe to Tekton news to be notified when the service is available.

Details Specs

Details

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 - 200 in-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 ±4.5 clockwise and counterclockwise on a torque wrench set to 150 in-lb.

Full-Range Calibration Using the ISO Standard

Standard	ISO 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 Point	5	3

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.

Since 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.

1/4 Inch Drive (20-200 in-lb)
#TRQ50402

Tekton 1/4 Inch Drive Micrometer Torque Wrench Illustration – Key to Table Comparing Swing Arcs

A. Overall Length	B. Tooth Count	C. Swing Arc	D. Length of Travel
10.1 in.	90 (Tekton)	4°	0.70 in.
	80	4.5°	0.79 in.
	72	5°	0.88 in.
	45	8°	1.41 in.
	36	10°	1.76 in.
	24	15°	2.64 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 (in-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 1.5 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

Specs

1/4 Inch Drive Dual-Direction Micrometer Torque Wrench (20 - 200 in-lb)

Drive Size	1/4 in.
Torque Range	20 - 200 in-lb
Accuracy	±3%
Measuring Direction	Clockwise and Counterclockwise
Certificate of Calibration	Yes
Calibration Standard	ISO 6789-1:2017
Tooth Count	90
Country of Origin	Taiwan
Item Weight	0.73 lb.