DeWalt DCF964 3/4-Inch Impact Wrench: The New Torque King We Kept Testing With Different Batteries

Introduction

DeWalt has been quietly building toward this one for over a year, and the DCF964 is the payoff: a ground-up 3/4-inch high-torque impact wrench and, by its own figures, the brand’s highest-torque pistol-style impact to date. While most brands simply swap a 3/4-inch anvil into an existing 1/2-inch high-torque tool and charge a little more, DeWalt built this platform properly, which is part of why its numbers caught so many people’s attention.

Because a motor this size is thirsty, the battery you feed it matters more than usual. Alongside the wrench itself, we look at DeWalt’s new tabless-cell 8Ah PowerStack and an unusual USA-made DeWalt-compatible battery brand called Titan, because the results turned out to be genuinely surprising.

What Makes the DCF964 Different

The DCF964 is the 3/4-inch version of the DCF961 platform, and the larger anvil is not just a cosmetic change. The hammer inside this tool is massive, requiring a two-stage planetary setup almost like a transmission plus final drive to spin it. Concentrating that hammer force onto a small 1/2-inch anvil is inefficient and hard on the person holding the tool, and the 3/4-inch square drive fixes a healthy portion of both problems. The result is more torque actually delivered to the bolt and, in most cases, a more manageable tool.

It also delivers that power with a distinctive punch: a brief lag after you pull the trigger before the impacts really kick in. It is entertaining to feel, but it takes getting used to. The kit ships with a 5Ah PowerStack battery, which is a sensible inclusion for a tool this demanding.

Torque Test Results

On a calibrated Skidmore dynamometer, the DCF964 produced 1,167 ft-lbs in a 15-second test, a new 3/4-inch record and comfortably above the 985 ft-lb figure of the Milwaukee M18 high-torque with a Forge pack and over 100 ft-lbs above a 1/2-inch DCF961 that had been converted to a 3/4-inch anvil with parts from past impact wrenches. It even delivered 89% of its claimed 1,420 ft-lbs tightening torque in testing, which is a strong showing in this crowd.

In forward working-torque tests the tool managed 673 ft-lbs, and in the 10-second reverse max test it crested 1,000 ft-lbs even on the included 5Ah PowerStack. Subjectively, the 1/2-inch DCF961 earned a record 9.25 handling score, while this bigger 3/4-inch model gets a still hands-on 8.5. You still need to anticipate that turbo-lag-style punch when it engages, and like all high-power impacts it can suffer from socket weld, sticking to the bolt head and chattering with no progress. DeWalt’s tools do this more than most, and while the 3/4-inch format lessens it, it is not gone.

Battery Testing: How Much Difference Does a Pack Make?

This is where things get interesting, because the DCF964 eats power. With the standard 5Ah XR pack it managed 844 ft-lbs and eventually shut off under load, completing only about 80% of the run with the trigger still held. The compact 4Ah DeWalt with 21700 cells did better at 983 ft-lbs. The included 5Ah PowerStack comfortably beat both.

DeWalt’s new 8Ah PowerStack with tabless 21700 cells pushed the tool to 1,265 ft-lbs, a new 3/4-inch record again. The standard 8Ah XR with 21700 cells managed 1,124 ft-lbs, and even the historically strong 9Ah three-row pack came in at 1,200 ft-lbs, beaten by the lighter, smaller new PowerStack. A word of caution: do not expect the same benefit on a smaller tool like the 1/2-inch DCF961. A lot of that extra power is simply wasted there.

Titan USA-Made DeWalt-Compatible Batteries

Titan is a new name in the power tool battery space, advertising batteries made in America, not just assembled there. They squeeze a real 4Ah into a housing the size of DeWalt’s tiny 2Ah pack and a claimed 8Ah into a standard 5Ah XR-sized case, using 4,000mAh Amprius 18650 cells, a US cell maker focused on energy density. We paid $98 for the 4Ah and $159 for the 8Ah, prices comparable to what the big brands charge.

In voltage-sag testing the packs dropped more under load than DeWalt’s 21700 packs, from 16 volts down to about 15.75 volts after 10 seconds of draw versus roughly 18.3 volts for the DeWalt 4Ah compact. On this particular tool, the results were poor: the Titan 4Ah could only work the impact at half throttle and shut off at full throttle every time, and the 8Ah managed 950 ft-lbs, good but unable to beat DeWalt’s 21700 packs.

The trade-off is clear. These are energy-density batteries, built for runtime versus size and weight. On lighter tools such as sanders, routers, nail guns, and impact drivers, you will likely get far more use per charge with a lighter overall tool than anything the mainstream brands offer. On a torque monster like this, they are simply the wrong tool for the job. At the time of writing they were already showing sold out on Titan’s website.

How It Compares to the Milwaukee M18 High-Torque

The Milwaukee M18 high-torque with a Forge pack measured 985 ft-lbs on the same dynamometer and 920 ft-lbs in the 10-second reverse test, a clear step behind the DCF964 in every configuration. Milwaukee has not yet released a 3/4-inch version of its high-torque, which is one reason the DCF964 has the segment largely to itself among the big two. That said, the DeWalt’s figures are only achievable with its strongest batteries; on weaker packs the gap narrows dramatically.

Things to Consider Before Buying

At $399 retail, up from $369, the DCF964 is not a bad ask considering the company it keeps at this end of the impact range, and it scores very well in the ranking at 542.335 points as a function of performance and price. It weighs 9.3 lb with a battery attached, another category record, and it set a new torque-per-unit-of-weight record in a ranking that includes nitrous-fed gas impact wrenches.

The downside of the 3/4-inch format is always sockets: these sets cost a lot, weigh a lot, and take up a lot of space in a toolbox. But if a 1/2-inch tool like a DCF900 or the Milwaukee 2967 is not taking a fastener off, this is the next frontier.

One reliability note: shortly after our test unit was returned, it developed a pop-rocks-like sound from the gearbox even at free speed. It could be a fluke, and a local DeWalt store warranty experience was expected to be painless, but it is worth keeping your receipts.

Buying Advice

If you regularly fight fasteners that overwhelm 1/2-inch high-torque impacts, the DCF964 is the most capable cordless pistol-style option we have measured in this class, and the kit’s included 5Ah PowerStack is the right starting battery. If you plan to push it to its limits, the 8Ah PowerStack is the pack that unlocks its full potential.

Conclusion

The DCF964 is a genuinely new kind of cordless impact wrench rather than a bigger anvil bolted onto an old design, and its test numbers back that up. Pair it with strong batteries, budget for the larger socket set, and it will handle jobs most cordless tools simply cannot.