Hello. So you are probably looking for a way to secure your seats without paying over $60. Unfortunately these bolts aren't the permanent answer for the following two reasons:
-They aren't rated for crash tests such as the OEM bolts
-These bolts cannot be torqued securely enough without the head snapping off.
I was able to snap the head right off the shank (bolt body), simply by hand-torquing the bolt in. This raised a concern for me to not use these for this purpose. (Note: The temperature outside was 40-50 degrees F but I'm not sure if the transition between ductile to brittle come into effect since I don't have material specs. On the other hand, this bolt could just be designed for light duty use and temperature does not come into play at all).
It must be noted though, that only the head snapped off from the top caused by applying more than it's rated torqued value. The head did not come off from the shear force that would be induced during a frontal car impact. Therefore, this incident wouldn't be a great scientific or engineering basis to rely on. With that said though, would you still want to take the chance during a crash? What if your family member is sitting in the passenger seat?
In order for these bolts to lock your seats in, you would need to tighten them enough to where you won't be able to remove them using a set of pliers. I was able to remove a one using a large plier without too much force. This was because I was not able to tighten them down enough without causing the head to snap off. This should raise a red flag for you. If a thief ever tries stealing your seats, all he or she would have to do is use a set of pliers to remove the bolt. With this said, why not simply use an adhesive compound such as loc-tite to semi-permanently lock the threads in place? From my experience, I would not rely on the head staying intact to the shank during an attempt to steal the seats. One could easily use the opposite end of their 3/8" ratchet and strike the head until it comes off due to it's weak composition. If the head does snap off, the seats will come loose and you will have to end up tapping the remaining bolt piece in your car. You'll have plenty of room to work with though once the seats are gone.
I have heard of other S2000 drivers use these with no problem without the heads snapping off though. Your call!
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Bought and went to rotate tires for the first time 5 months later. 2 of 4 heads snapped off when attempting to unscrew them for the first time. Since there is no head, they are useless at this point. 1 month warranty does not give the product time to be used except to put them on initially.
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