Search  for anything...
ACDelco Tools

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

  • Based on 226 reviews
Condition: New
Checking for the best price...
$241.99 Why this price?

Buy Now, Pay Later

As low as $40.33 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Oct 12
Order within 22 hours and 43 minutes
Available payment plans shown during checkout

Recently Viewed

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)

Brand: ACDelco Tools


Material: Alloy Steel


Item Weight: 0.01 Kilograms


Item Package Quantity: 1


Head Style: Fixed Ratchet


Brand: ‎ACDelco Tools


Material: ‎Alloy Steel


Item Weight: ‎0.01 Kilograms


Item Package Quantity: ‎1


Head Style: ‎Fixed Ratchet


Finish Type: ‎Polished


Item Torque: ‎2.5E+2 Foot Pounds


Operation Mode: ‎Battery


Voltage: ‎1.5 Volts


Manufacturer: ‎Durofix, Inc.


Global Trade Identification Number: ‎20


Part Number: ‎ARM303-4A-340


Item Weight: ‎0.352 ounces


Product Dimensions: ‎2 x 2 x 26.25 inches


Country of Origin: ‎Taiwan


Item model number: ‎ARM303-4A-340


Batteries: ‎2 CR2 batteries required.


Is Discontinued By Manufacturer: ‎No


Size: ‎1/2"


Style: ‎Wrench


Finish: ‎Polished


Power Source: ‎Battery Powered


Measurement System: ‎Metric


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


Batteries Included?: ‎No


Batteries Required?: ‎Yes


Battery Cell Type: ‎Lithium Manganese Dioxide


Warranty Description: ‎1 Year Limited Warranty


Date First Available: June 3, 2016


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Oct 12

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Great torque wrench and easy to use.
Style: Wrench
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
    • Outstanding Torque wrench
Style: Wrench
I have a few torque wrenches from a variety of manufacturers. Dial, click and electronic. Proto, Quinn, Lexivon, TZTools and now ACDelco. The click type are fine, but incomplete in doing many proper torque functions. In many cars' brake and suspension (and engine) torquing, the service manual will say to torque to a specific value PLUS a certain degree. (Such as torque to 70nM plus 30 degrees.) With click and dial type torque wrenches, you can get the torque value, but either need to guess at the degree or use a protractor (a complicated and not speedy process). With the ACDelco electronic torque wrench, you can get the torque and degrees with precision. This model will give accurate torque values from 12 ft-lb to 250 ft-lb. This is a great range. But the arm is long for the lower torque values. A shorter torque wrench such as the ACDelco ARM601-3 3/8” (3.7 to 37 ft-lbs.) would be a good addition to this one. Having these two torque wrenches would handle any torque requirements. ... show more
Reviewed in the United States on June 23, 2024 by Clark Brown
    • LOVE THIS TOOL SIMPLE AND GREAT
Style: Wrench
I ahve worked on cars since i was 16 and am now 784 have done all family mecanics , i am not a mechanic but do my own, neve rhad a wrench that would do all the torquing, I was concerned about how dificult it would be to use this, it was just plain simple and easy, what a tool and i trust delco anything, that is why i bought delco ... show more
Reviewed in the United States on June 17, 2024 by thampton
    • Cant complain
Style: Wrench
this allowed me to finish assembling my engine M13A for a Suzuki Jimny without much issue, its easy to figure out and easy to set to what ever values you need. The built in angle reading is the biggest selling point for me and set all the bolts to what I needed it to go to, the only gripe I have is that when setting two angles for eg the crank bolts require you to set to 25Nm then 60deg twice since i am running through them in a specific pattern it the toque wrench only shows me the peak torque for the first pass. when doing the second angle pass it does not show the final torque. And that so far is the only gripe I have with the wrench ... show more
Reviewed in the United States on June 4, 2024 by Amazon Customer
    • Just buy it
Style: Wrench
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
    • The Best One So Far
Style: Wrench
The Wrench is 26" tip to tip. with the 2 AA Batteries it weighs 3.25 lbs. The Case is 3.5 lbs. The head of the wrench is 2" x 2.5". To open the battery case, Twist the end of the wrench 1/4 turn counterclockwise 1/4th a turn. Insert 2 AA batteries positive end first. Replace the battery compartment cap and press the "C" button to start up. The solid metal case has a form fitted compartment which holds the wrench tightly. If you store the wrench in a warm toolbox or tool chest in the bed of your truck, I would remove the batteries as I usually forget to check the batteries in all my tools, only to find the batteries have lost their charge and have leaked inside the tool. When you register the Wrench to get the 1 Year Extended Warranty, you will need the information from the store you bought it from. These wrenches come from Durofix.com Your Amazon receipt has the model and date of purchase date. and the serial number is etched just below the "AC Delco" on the handle next to the Socket head. They will send you a conformation of registration and warranty by email. If I left anything out you need to know, let me know. Consumers need to watch out for each other. hypernez ... show more
Reviewed in the United States on May 20, 2024 by Frank Nunez
    • Works well
Style: Wrench
Worked perfectly for required angle torque. Alarm sounds and lights worked well to let you know when you were getting close to torque and when you reached it.
Reviewed in the United States on November 20, 2024 by Edward D. Zimmerman

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...