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12mm Genuine Toyota knuckle stud (new version).
“hexalobular” (=has 6 point male torx at the top for tightening into place).
This is the new and updated part from Toyota that replaces all knuckle studs from early versions. It is slightly longer than the previous versions, and has thread locker installed at the factory on the end that goes into the knuckle.
It's important when performing work on steering components that all the parts being bolted together are clean and dry. This means that the nuts, studs, washers, cone washers, steering knuckle mating surfaces, and the steering arm mating surface must be entirely free of grease, oil, paint, and dirt.
The reason for this is that friction is what prevents the surfaces from moving against each other when properly torqued into place, and any contaminant on the mating surfaces may act as a lubricant causing shearing forces which is amplified when larger than stock tires and wheels are used.
Knuckle studs should be set into the steering knuckle with a small amount of thread locking compound applied to the threads if it is not pre-applied by the factory. The studs should then be hand-tightened into place using the Torx hex (new style studs) or the double nut technique for older style studs so that they are "snug" which is going to be about 20 ft lbs give or take.
Studs are NOT torqued into place as this may lead to steering knuckle thread damage as the only thing preventing the studs from going too far is the non-threaded shank between the two sets of threads.
When completing the installation of the steering arms and the bearing retainer on the opposite end, thread locking compound does not need to be used, however the appropriated graded OEM type flat washer or locking washer must be in place.
Toyota has used several different styles of washers over the years on the knuckle studs. Where a split style lock washer or a split style wave lock washer are used the split must not be opened up (no gap), must not spread open when being torqued to specification, and must have enough edge present to grab the nut to effectively lock the nut into place depending on the style of the washer.
Part of the job of the cone washer is to also lock the stud into place and prevent movement. The cone washer also acts to center the steering arm and reduce any potential play to zero while locking the steering arm down.
Where knuckle studs have been secured into place with with an overly powerful impact gun, it is likely they they have been over-torqued and stressed, and should be replaced with new items so as to prevent stud failure.
out of date pns:
Toyota - Japan
2022 05 25
2023 08 21