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ACDelco

ACDelco ARM303-4A-340 1/2" Heavy Duty Digital Torque Wrench with Buzzer and LED Flash Notification - ISO 6789 Standards with Certificate of Calibration

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Availability: 18 left in stock
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Arrives Sunday, Sep 13
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Features

  • EASY TO USE Lightweight and precise digital torque wrench (12.5 to 250.7 ft-lbs.) with real-time torque display, multiple measurement modes, and battery level indicator. Ideal for automotive, motorcycle, and industrial use.
  • SUPERIOR QUALITY Built for precision and durability, this digital torque wrench features a clear LCD screen with an audible alert when the desired torque is reached. Made with industrial-grade alloy metal, it ensures long-lasting performance for years with proper use.
  • USER-FRIENDLY Designed for comfort and control, featuring a lightweight composite housing, hardened steel alloy body, and an ergonomic soft-grip handle for reduced vibration and fatigue. The slim, balanced design ensures a secure grip for maximum precision during extended use.
  • VALUE KIT Includes a digital torque wrench, user manual, and a durable hard-shell case for protection and storage. Powered by 2 AA batteries (not included) for convenience.

Description

The ACDelco Brand has been around well over 100 years and its name has become synonymous with quality & reliability. ACDelco power tools are built for people who make a living with their tools, day in and day out, and require exceptional sturdiness and reliability. ACDelco offers the most complete line of digital torque wrenches and adapters for professionals who require high precision measurement on torque (ft-lbs./Nm/Kg-cm/in-lbs.) and angle degree for their job. Please use selection guides to choose the right digital torque wrench with right torque range for your application.FEATURESStatic torque measurementStandard functions: torque setting, measurement setting, mode settingOperation in both clockwise and counterclockwise directionsLCD display shows (Kg-cm, N-m, in-lbs., ft-lbs.) measurementsTorque Measurement Range]: 12.5 – 250.7 ft-lbs., Pre-set Accuracy CW +/- 1.5%, CCW +/- 2.5%.Digital torque: reversible, precision geared 72-tooth ratchet head measures torque in clockwise & counter-clockwise directions with anti-slip industrial grade grip design.Audible & visual alert system Specifications - Model Number: ARM303-4A-340 - Head Size: 1/2" - Torque Range: (12.5 to 250.7 ft-lbs.) - Tool Weight: 6.6 lbs. (3.00 kg) - Battery: 2 AA batteries (Not included)

Color: Black/Red


Brand: ACDelco


Material: Alloy Steel


Item Length: 66.7 centimeters


Item Weight: 6.6 pounds


Head Style: Fixed Ratchet


Item Torque: 250 ft-lb


Operation Mode: Battery


Voltage: 1.5 volts


End Style: Socket End


Measurement Standard: SAE (Inch)


Wrench Length Style: Standard


Material Type: Alloy Steel


Finish Types: Polished


Color: Black/Red


Item Length: 66.7 centimeters


Item Weight: 6.6 pounds


Package Quantity: 1


Brand Name: ACDelco


Model Number: ARM303-4A-340


Unit Count: 1 Count


Manufacturer: Durofix, Inc.


Global Trade Identification Number: 20


Included Components: Calibration Certification, Digital Torque Wrench, Metal Case, User Manual


Manufacturer Part Number: ARM303-4A-340


Manufacturer Warranty Description: 1 Year Limited Warranty


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Sep 13

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Great torque wrench and easy to use.
Purchased mainly for the degree feature on this torque wrench as the wrench isn't really used for much else in my own opinion because just due to the precision of this torque wrench i wouldn't advise using it on torquing wheels. This torque wrench is mainly for torquing cylinder heads or crankshaft bearings or other torque applications that involve critical torque. Many i work with say "why not buy a Snap-on Tech Angle". The reason is because they are just too expensive so this is the next best option. I already own the 3/8 Digital Torque Wrench from ACdelco and have had nothing but success with it as i personally love it but trying to torque cylinder head bolts with a 3/8'' torque wrench is difficult so i had to purchase a 1/2'' version. Couple features about the torque wrench as it does N-m, Kg-cm, In-lb., Ft-lb, Angle Degree. The buttons are very easily to switch between different modes and the most feature used is the angle mode as it is EXTREMELY HELPFUL. It's just so simple as you press A-F-K button until it shows the degree in the corner then you toggle up or down to set the degrees. Now i seen many reviews that when you reach a degree it doesn't stop and reset, you have 0 it and restart and yes that is correct as it isn't like the Snap on that resets to 0 when you reach a preset degree. You will have to 0 it and then move on to the next bolt but if you try to turn it on the next bolt the buzzer with sound telling you that you have reached the degree. It's almost dummy proof in my opinion. The torque wrench is a good quality torque wrench as i have used it several times on cylinder heads. I think the only issue i see is when you are using degree tracking, the tracking works surprisingly well as it when you need to ratchet it back to swing the degree keeps set at what you stopped at but it does take a second for it to compensate as when you swing then sweep more degrees it will almost like not measure the degree. Also the ratchet is not a fine tooth ratchet so when you are sweeping it may not register a degree because it hast''t engaged on the next paw in the ratchet gear. It's not a horrible digital torque wrench, the accuracy i spot on as i have used on digital torque wrenches such as the Snap-on's and all seem to be inline with the correct torque. However the degree tracking it a little troublesome to get used to, it does work and i haven't had any issues yet and all seems to be going okay. Overall, i would say i would recommend this torque wrench as a substitute because it's a good decent quality torque wrench just half the cost of others. ... show more
Reviewed in the United States on April 28, 2019 by Mystery_Shopper
    • Precise
The ACDelco 1/2-inch Digital Angle Torque Wrench has become one of my go-to tools in the shop, especially for engine and drivetrain work that calls for torque + angle procedures. It’s accurate, easy to use, and built like a tank. The digital display is clear and easy to read, and the beep + vibration feedback makes it almost impossible to overshoot a spec. Whether I’m torquing cylinder heads, flywheels, or axle nuts, I trust this wrench to get it right every time. The angle function is a game changer — no need for an angle gauge or guessing. Just set the torque and angle, and it walks you through both steps. Great for newer vehicles that list torque-to-yield specs in degrees. Battery life is solid, calibration feels tight, and the tool itself has a nice heft without being bulky. It’s also great that it stores torque history and works in ft-lb, in-lb, and Nm for versatility. If you’re serious about precision and work on modern engines or suspension systems regularly, this wrench is worth every penny. It’s not just a torque wrench — it’s a diagnostic tool for fastener integrity. ... show more
Reviewed in the United States on June 15, 2025 by Draven
    • Fantastic for TTY fasteners
Easy to use, easy to set, easy to hear. Overall it is great. If I had one complaint, it is that the auto-shutoff is a bit aggressive. A couple times I set it, hand tightened a bolt, and it shut off before it registeres that I was using it.
Reviewed in the United States on December 3, 2022 by Andrea Redmond
    • Battery was getting stuck in the wrench
Review Image by <insert vaguely entertaining name here>
Accuracy on mine seems spot on, even at the lowest values, but I'd still verify things before using it on anything sensitive at low torque. The lowest calibration point is at 68N.m (~50ft-lbs), and they only guarantee accuracy in the 20-100% range. You'd be taking a very expensive gamble using these on spark plugs, for example. The auto shut-off time for these seems to be 3 minutes, which is better than the 2 minutes on many of the competing products, but I don't think the angle gyro is used to keep it on (if you're holding it, vs it being on the ground), which is a shame. The main problem I had was with the battery compartment. An assembly screw was too long and it was indirectly squeezing the battery tube. One of the AA batteries kept getting stuck in the wrench and refused to come out. The moment I started to loosen the screw (the one holding the knurled red grip in place) the battery immediately came free. I'll probably just grind down the screw or something so it's shorter, but it's definitely a pain. ... show more
Reviewed in the United States on July 16, 2023 by <insert vaguely entertaining name here>
    • Exelente
Excelente
Reviewed in the United States on July 8, 2026 by Kevin ochoa
    • WISH I BOUGHT SOONER
Absolutely a GREAT deal. Wish I had bought sooner. Needed torque angle before and can tell you my method was not even comparable to this. Super easy to use. Built an engine today that required torque specs and 105 degrees of tightening after. I am not a professional mechanic, but I can do anything with enough time and money. I was pleased with the ease of use, and the feeling of knowing it is done right. If you are questioning (as I did) don't hesitate to buy. Added bonus the case it comes in was a surprise as well super nice and padded inside. ... show more
Reviewed in the United States on February 3, 2021 by Derick Moore
    • Cheap plastic on the end
Review Image by Cesar Alexis
works i like the display everything that goes with it ,the torque it just right ,accuracy is good the size is perfect for torquing wheels but the feel is alr but cheap the plastic tip of the battery broke and the battery keeps falling which don’t let the torque even read because it turns off and on
Reviewed in the United States on July 30, 2025 by Cesar Alexis
    • Just buy it
Works great. Calibrate in about 3 seconds. Loud beeps. Angle is spot on. Tested torque on snap on truck it was .63 off and that’s good enough for me. I’ve rebuilt 3 motors with it in about 6 months and still works as good as new. Case is super nice. Only thing I don’t like is how slow changing torque or angle takes. Won’t start skipping by 5 or ten. Definitely worth the money. And yes it works better then the snap on one I had before. The snap off one lasted 1 year and it fried. We will see how the longevity is with this ac delco. ... show more
Reviewed in the United States on April 27, 2025 by Amazon Customer

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