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This is kind of off topic but fastener is a very specialized field. There is a group of fastener experts at my work and they can tell you everything about nuts and bolts. Torque value translates into tension of the bolt (stud in this case). The lug nut and stud basically serves two purposes. The first one is to hold the wheel in place without any displacement so that the wheel is tight against the hub and the second is to prevent the nut from backing out. The specified torque values in the manual are usually set based on a wide range of installation conditions (environmental, temperature, cleanliness….), such as in your home garage, on the track, roadside…etc. If the nut and bolt are dirty with sand on the thread, the torque requires to compensate the friction is a lot higher than a clean lubricated nut and bolt, which translates into a much higher tension value to the bolt/stud with the same applied torque. One of the worst cases is cross thread. My point is no matter how accurate the torque wrench is, there are other factors that affect the torque value of nut and bolt. In my opinion, the 80 ft/lb is set for preventing the nut to back out.
This is kind of off topic but fastener is a very specialized field. There is a group of fastener experts at my work and they can tell you everything about nuts and bolts.
Torque value translates into tension of the bolt (stud in this case). The lug nut and stud basically serves two purposes. The first one is to hold the wheel in place without any displacement so that the wheel is tight against the hub and the second is to prevent the nut from backing out. The specified torque values in the manual are usually set based on a wide range of installation conditions (environmental, temperature, cleanliness….), such as in your home garage, on the track, roadside…etc. If the nut and bolt are dirty with sand on the thread, the torque requires to compensate the friction is a lot higher than a clean lubricated nut and bolt, which translates into a much higher tension value to the bolt/stud with the same applied torque. One of the worst cases is cross thread.
My point is no matter how accurate the torque wrench is, there are other factors that affect the torque value of nut and bolt. In my opinion, the 80 ft/lb is set for preventing the nut to back out.
