![]() *It's a complex subject and "it depends" is the guideline, but in general terms this is correct for the sake of conversation. I d o not use anti-seize compound on the threads, which can cause the nuts to turn too easily and result in over-torquing, possibly stretching the lug and/or causing multiple other problems. 687, which is a standard size for this style wheel and they take a 21mm socket for installation. The aluminum rim will flex when tightening the nuts, to avoid deformation I tighten all nuts to (for example) 50 ft*lbs, then all nuts to 65 ft*lbs, then 70, then 75 ft*lbs, making sure to torque to whatever the manufacturer specifies as a correct final value. In summary, I want steel wheel studs and nuts, with aluminum alloy rims. Rims are commonly made from a strong aluminum alloy because of the rotational mass and unsprung weight, but are also much more expensive than steel. Low-carbon and mid-carbon steel strain hardens at a much lower rate and tends to fail gradually ( due in part to vibrational reversal of hardening), which is why wheel studs and nuts are made from steel (plus they're small and light). 6061 is also much easier to machine, so the parts should in theory cost less to produce (although that doesn't mean they're priced differently).Īluminum strain hardens "easily," stress fractures (due to repeated strain) are common, and failure is sudden this is why frames are generally not made from aluminum alloy. However, 6061 is more oxidation resistant, especially when electroplated. Strength depends on which alloy is used, the most common alloys used in aftermarket parts are 6061-T-T6.ħ075 is stronger than 6061 aluminum due to the mechanical properties of 7075 aluminum. For example, a 12mmx1.25 lug nut has a 12mm diameter, and a thread pitch of 1.25mm. Aluminum is very soft, so aluminum alloys are used to combine multiple desirable properties such as increased strength as compared to pure aluminum yet lighter weight than steel. On standard lug nuts, the thread pitch is the number of threads per inch. ![]()
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