Factory Mazda alignment bolt kit
This complete kit includes enough hardware to replace every alignment eccentric bolt on the car
90-05 Miata MX5
Get rid of that clunk!
Mazda improved the bolt and washer design for the NB which supercedes the NA bolt design. These are the latest fine thread, double notch version. Factory torque spec is 69-83 ft/lbs.
If you have had any recent suspension work and picked up a single loud clunk under hard braking or turning, chances are your alignment bolts are worn out. Another clear symptom of slipping eccentrics is having your steering wheel centered when driving straight then being un-centered or shifting orienation after turning one way, then shifting back when you turn the other way. That is your camber (and toe) changing on one front wheel only from slipped alignment eccentrics. While active alignment sounds cool, it’s not really.
Notes for competition use (does not apply to street only cars)
For any R compound or EHP (RS3, Start Spec, Rival) used on track or autocross, these bolts in the forward location on the front control arm (camber) are consumables. Under such usage the bolts must be over-torqued to keep from slipping and as a result, begin to yield (stretch) after a few alignments. The other positions can be kept just over factory torque specs. The forward front control arm bolts need to be torqued ah, a lot. How much exactly, is up to you. We have a few special 20″ long 17mm box end wrenches we hang off of. That ends up being considerably more than OEM specs. We will not publish, nor quote our spec because lawyer.
We keep a few spares in our box when we go to the track. If you find yours slip and need to be tightened more than once in between alignments, they’re done.
NAY9-28-6AZ Bolt kit includes
- 8x bolt NA80-28-66ZD
- 8x eccentric washer NA80-28-473A
- 8x self locking nut B001-39-037B
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