Hmmm it's almost impossible to answer your question! Toyota
(as with most other auto manufacturer) use different size and length threads for different applications.
Toyota are quite difficult in that they use
"odd" sized threads quite often.
By that, I mean non standard sizes.
To explain, and partly answer your question.
A thread has three important measurements.
The diameter, the pitch and the length.
Taking an example of M10x1.5x100
The diameter is the outside diameter of the thread.
So for an M10, it's M(metric), 10 mm.
The pitch, 1.5.
This refers to the distance between the threads, be it the top or the bottom, it's the same.
The length.
This can differ slightly, but mainly it's the length of the bolt from the under side of the head of the bolt to the end of the bolt.
If you have a bolt that has a section of un-threaded bolt, this is still included in the overall length.
So in my example, it would be a bolt with a 10mm diameter thread, with a pitch of 1.5 and an overall length of 100mm.
Where it becomes difficult is that Toyota sometimes use bolts/threads of a finer pitch.
A standard M10
(just for example) has a pitch of 1.5mm between threads, but Toyota sometimes use a
fine thread which has a 1.25mm pitch.
The only real way to replace all your bolts is to remove each one and measure it
(for length and diameter use a set of verniers, and for pitch use a thread gauge) and purchase a direct replacement.
Hopefully that's given you a little insight into how a thread is explained.
Any questions feel free to ask and I'll try to explain
(it's a bit tricky though!).
