Peer Review
When you spend $590 on a professional grade, cordless, impact it has a large list of expectations to live up to. The impact I chose was a Snap-On model number CT685 it is a professional grade high power impact wrench with an 18v Ni-Cad battery. I have been using this impact at the dealership I work at, for a little over two years. Overall this is a very well built and user friendly piece of equipment, I will cover all the reasons I believe this impact lives up to the design you would expect in a $600 tool. First off, this tool has been designed to take a beating and never misses a beat! I use this tool every day in a large variety of situations. It is a ½ inch drive impact wrench that I use for a variety of jobs. After two years I have never once had a problem with anything I’ve put it through. Such as, routinely getting covered inside and out with oil and coolant, wedging it into places it probably should not fit, and then needing to remove it from those tight places. It has even survived the occasional drop to the floor, sometimes from as high as 7 feet off the ground. This kind of durability is mainly due to the construction of the tool body. The nose of the tool is magnesium, which is strong and handles impacts very well. The rest of the body is a high strength molded plastic, which allows the motor to stay cool. They wrapped a soft rubber coating around the plastic body, which serves multiple purposes. It acts as an insulator for your hands so that all of the impacts from the wrench are not transferred to your body; also it makes the unit much easier to hold on to, especially when oil or coolant builds up on it. The rubber also absorbs the impacts if the tool would be dropped on the ground. Secondly this tool really packs a punch! The torque specifications for this model are as follows; 400 foot pounds during operation. The impressive part is that when you are trying to break a bolt loose it will bump that number up to 620 foot pounds. So what that means is, for those hard to remove bolts that are rusted on, it will be hit with 620 lbs. of force to break them loose and 400 lbs. until that bolt or nut is off. For comparison, a similar impact that runs off of air pressure has an operational torque of 525 lbs. So you are receiving very close to the same amount of power but, without the bulky hose dragging behind you. Thirdly is the area that most people have the most concerns with; the battery. The CT6850 uses a nickel-cadmium battery, better known as a Ni-Cad battery. They are rechargeable 18 volt batteries with 2.5 amp hours of power; they have a charge time of 40 minutes from completely dead to full charge. Under normal use I will get a full days use out of one battery. If you are using it at max power over long periods of time the battery may only last roughly half a day. The set comes with two batteries so as long as you keep one on the charger you will not wear down the battery before the second one is at full charge. The batteries have a dual slide locking mechanism to attach to the impact, which keeps them secured to the tool even under the most brutal conditions. The batteries are also built just as durable as the tool itself. Over the two years of abuse I have put mine through I have only run into one problem. That was the time the whole tool ended up in a small pond, which in return shorted out the battery. I will say though, the impact wrench was