Bosch GDS18V-350N and GDS18V-780N: Two New Mid Torque Impact Wrenches Put to the Test

Introduction

Bosch has been quiet in the impact wrench space for a while, but they are back with two new models that could shake up the category. The GDS18V-350N is positioned as a compact mid torque, while the GDS18V-780N is the full-size mid torque contender. Both tools were tested against the current competition to see if they can finally challenge the long-standing leader in this class.

The results are surprising, to say the least. One of these tools is a genuine game-changer, while the other leaves a lot to be desired. Let’s dig into the details.

Evaluation Criteria

To give both tools a fair assessment, we ran them through a series of standardized tests. These include the industry-standard working torque test, a 5-second forward test, a 10-second max torque test in reverse, and a 15-second best-case scenario test with fresh batteries. We also measured each tool’s length and weight, and we tore down the GDS18V-780N to examine its internal construction.

The leaderboard scoring takes into account maximum torque output, torque per inch of length, and value for money based on the retail price.

Bosch GDS18V-350N: The Compact Disappointment

The GDS18V-350N is a compact impact wrench that Bosch is calling a mid torque. At 5.22 inches long, it sits right at the average length for a cordless compact impact wrench. With a 4 amp hour Core battery attached, it falls into a nice, portable category. The tool is rated at 410 ft-lbs of breakaway torque and 250 ft-lbs of tightening torque.

In our working torque test, the GDS18V-350N managed 177 ft-lbs, which slots it in with the competition from other brands. However, in the 10-second max torque test in reverse, it only mustered 191 ft-lbs. That is a disappointing figure, especially when compared to older and cheaper models from Bosch itself.

The GDS18V-230, an older model that costs less, actually outperforms the newer 350. The 230 model makes 236 ft-lbs, which aligns with its 230 ft-lbs rating. The 350, despite its higher rating, falls short. This suggests the 350 might be a repurposed impact driver with an anvil swap, given its high IPM and dyno curves that resemble an impact driver more than a dedicated impact wrench.

Bosch GDS18V-780N: The Mid Torque Champion

The GDS18V-780N is the main attraction. This is a full-size mid torque impact wrench with a stout, chunky appearance. It measures just over 6.6 inches long, which is shorter than the 6.9-inch DeWalt DCF 891, the previous leader in this category. The tool is rated at 575 ft-lbs of tightening torque and 740 ft-lbs of nut busting torque.

In our forward working torque test, the GDS18V-780N delivered 410 ft-lbs with a standard battery. When paired with the recommended ProFactor battery, that number jumped to 433 ft-lbs. In the reverse max torque test, it hit 487 ft-lbs with the standard battery and 533 ft-lbs with the ProFactor battery. In the 15-second best-case scenario test, it reached 601 ft-lbs with the standard battery and 630 ft-lbs with the ProFactor battery.

These numbers are remarkable. For the first time in four years, a tool has beaten the DeWalt in the mid torque category. The GDS18V-780N achieves this with a unique design that prioritizes the hammer assembly.

Inside the GDS18V-780N: What Makes It Tick

The internal design of the GDS18V-780N is where the magic happens. The tool features one of the smallest brushless motors we have seen in this class, with a massive amount of room dedicated to the hammer assembly up front. The hammer itself weighs 1.7 lbs, which is significantly heavier than the 1.2 lb hammer found in the DeWalt.

The hammer diameter is 20% larger than DeWalt’s, which adds mass and places it further from the center. This results in longer dogs on the anvil and more impactful hits from a physics standpoint. The tool also features a solid brass bushing up front and a wide surface to spread side loads over the anvil. A Teflon ring seal keeps the grease inside when the tool gets hot.

The electronics are potted in the center handle, where they are less affected by vibration. The entire assembly sits in a cast aluminum housing that snakes its way up to brace the brushless motor. This is a design we have not seen before, and it likely aids in heat dissipation. The tool also uses a KU trigger mechanism with a bellows to prevent dust ingress.

Performance Testing: Forward and Reverse

The GDS18V-780N’s performance is consistent across all tests. It hits 2,400 impacts per minute, which is slower than the DeWalt’s 3,250 and the M18’s 3,500. However, this slower rate is intentional. The tool chugs away, saving its special skill for the end when other tools are slowing down. It delivers more impactful, albeit slower, hits that are exactly what you need when budging something free.

The tool’s dyno curves show that it makes progress down low with lots of hits, but the real advantage comes at the top when things are tight. This is the opposite of the compact 350 model, which struggles to provide the punch needed once resistance builds.

Overall Buying Advice

The GDS18V-780N is a standout performer that deserves serious consideration. At a retail price of $199, it offers exceptional value, especially when compared to the previous Bosch mid torque that cost $219 and delivered significantly less performance. The tool’s leaderboard score of 395 to 402 points places it at the top of the mid torque category, and it even sets a new record for torque per inch.

There are a few minor concerns. The side housing bolts on our test unit were not tightened down properly, and the hammer case screws lacked Loctite. If you buy this tool, it is worth snugging up the side bolts and applying blue Loctite to the front screws. This is a simple fix that will ensure the tool stays together during heavy use.

The GDS18V-350N, on the other hand, is harder to recommend. Its performance is underwhelming, and it is outperformed by cheaper and older models. If you are looking for a compact impact wrench, there are better options available at a lower price point.

Conclusion

Bosch has delivered a mixed bag with these two new tools. The GDS18V-780N is a genuine triumph, combining a powerful hammer assembly with a compact form factor and an attractive price. It finally dethrones the long-standing leader in the mid torque category and sets a new benchmark for performance.

The GDS18V-350N, however, is a miss. It fails to live up to its mid torque billing and is outperformed by tools that cost less. If you are in the market for a mid torque impact wrench, the GDS18V-780N is the clear choice. The compact 350 model is best avoided unless you find it at a significant discount.