Taller versions known as duplex length are common today because of longer lug stud length. This practice was short lived and, hopefully, most of the wheels aren’t around any longer.) The two basic styles are a bulge hex, which has a 3/4-inch diameter hex, and the standard acorn, which has a 13/16-inch diameter hex. (There have been variances in the past that required using the wheel manufacturer’s lug kit. The seat on this lug nut is almost always at a 60-degree angle. The most common type of lug nut is the conical seat lug nut, sometimes referred to as acorn style. Try them combined with centric rings to make a front-wheel drive car with lug centric wheels ride smoother. One benefit is that the short shank design can be used in many (but not all) wheels to help center the wheel onto the lug studs. This wheel application isn’t used today, but the ET Mag style lugs are common. The original wheels required this lug, along with a special washer that was beveled around the punched hole to allow for the lug nut to seat in the center of it. This is a conical seat lug nut with a short – usually 1/4-inch – shank at the bottom. The AR Torque Thrust uses a plain round, center-punched washer for each of the bolt patterns. Center punched and offset versions are used for the same applications mentioned above with the Cragar. The Keystone washers have an oval outside shape and are flat. Notice that the washers are stamped “wheel side.” Make sure to place this side toward the wheel surface because the washer is concave, which assures that constant tension is being applied to the lug nut. The offset washer is used for 5×4.5 and 5×5 bolt patterns. The center-punched hole washer is for 5×4.75 bolt patterns. Notice that each has a round outside diameter, but one has the hole punched in the center and the other is offset. Take a look at these Cragar style washers. The washers are quite a bit different, as well. Each is designed to fit a specific wheel application and will also need a washer, either separate or built on. There are other Mag shank lugs with varying lengths. You should have about 1/8-inch of clearance between the end of the shank and the mounting surface of the wheel. Most of the wheels mentioned here use a 3/4-inch shank, which is measured from the bottom of the hex to the tip of the lug nut. First of all, make sure that you have the correct length shank. This can be one of the most difficult wheels to install and center on a vehicle. The Cragar and Keystone wheels are built for tri-lug fitment, which means you can use the same wheel on a 5×4.5, 5×4.75 and 5×5 (1/2-inch stud only) bolt pattern. I still sell and install many of these types of wheels and lugs, especially since the muscle car market continues to grow. Going back before many of us, including myself, were even born, the Mag style lug nut was common on Cragar S/S, Keystone Klassic and American Racing Torque Thrust wheels, among others. Knowing these differences and how to properly torque the lugs will help you avoid being involved in a case like the ones above. There are a number of different types of lug nuts and sizes, some of which are very close but are not interchangeable. Lug nuts are part of the wheel off landscape, so let’s get back to basics, at least as it involves some performance fitments. The nut was not threaded properly and the impact gun didn’t seem to care. Just last week, we replaced a lug and stud that was destroyed because the technician (who worked at a national chain) barely placed the lug on the stud, then hit it with the impact gun. One of the above cases dealt with a “wheel off,” one of the most common situations in our industry. How many times have we let our guards down when it comes to following proper procedures and safety guidelines so that we can address the next customer or deal with the next problem? Reading further down the list of settlements, several indicate that this firm was able to gain a successful verdict for a client after another lawyer had advised the plaintiff that there was no case. Settlement when wheel came off of a moving truck and struck a driver in the chest, killing him: $1,875,000.ĭo I have your attention? The preceding statements were taken directly from a law firm’s Web site.
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