S14 Caliper Bolt not Fitting into Alimuminum 300zx Calipers

[Karateboy88]

As stated in the thread title, its not going in.

The width of the bolts is the same but the pitch of the thread is different.

I've done some searching and it seems that the boltsrequired for the 300zx calipers is 12mm 1.25mm.

Can someone confirm? Would anyone also know what is the pitch of the S14 calipers?
Modified by Karateboy88 at 5:04 PM 8/3/2009

[E7-S14]

i just did this and i used my s14 stock caliper bolts

i did have to put an extra washer in the bottom two bolts for some reason.but the thread pitch is the same...

if you have the z32 bolts try them..but there shorter..

[Karateboy88]

I don't have the 300zx bolts or else i could match up the thread lol

I have brand new/rebuilt ones so I'm worried that they re-tapped the holes with a higher pitch.

[AZ89two4Tsx]

What do your bolts look like?

The correct ones should have a big a** shoulder on them.

And if the bolts are like Q45/J30 calipers they should be either 13mm or 11mm, I can't remember. It's some odd number size you can't get in stores.

[Karateboy88]

The only bolts I have are the stock S14 ones. They fit into my stock front calipers.

[E7-S14]

well thats strange..

do they tread into the z caliper at all?are they alum? or iron?

i doubt theyd strip the iron threads. but id be carefull with the aluminum.

could be junk inside the thread??

[Karateboy88]

My bolts are steel and my calipers are aluminum.

They don't fit more than 1/2 turn-which I why I think the thread pitch is different.

I know that I can screw in the bolt with a ratchet. However, the bolts doesn't doesn't go in smoothly which is weird because the bolt is clean and lubed and the caliper hole is brand spanking new.

I don't want to mess up the caliper and I already see the thread a little wiggled in the first mm.

[AZ89two4Tsx]

You'll need to get 300zx specific caliper bolts. END of story.

You'll either need to get them from a junkyard or dealer. Again, they are VERY specific. They aren't just a regular bolt, so don't try to cob something together.

You're either going to have to go to a junkyard or Nissan dealer. If they're interchangable with the Q brakes, you can use Q45/J30 bolts too.

Good luck.

[Karateboy88]

Thanks.

I'll hit the junkyard tomorrow and if they don't have it, I'll just hit up the dealer.

[E7-S14]

i still find that weird.i used my stock bolts.

screwed them in.then took them out a couple times..no problems..

as far as i knew the z32 bolts are too short for the s14 spindle..

[Karateboy88]

i still find that weird.i used my stock bolts.

screwed them in.then took them out a couple times..no problems..

as far as i knew the z32 bolts are too short for the s14 spindle..

Which calipers do you have? Maybe we h ave different ones

[E7-S14]

30mil 300zx calipers.

one had the Z32 bolts still in it.. and the thread pitch was the same.i took the washers off those to space my bottom bolts.

i just find it weird that yours arent working.thats all

[SmithSR]

They are the same thread pitch.

What likely is happening here, and since I don't see evidence posted to the contrary, is likely a bur on the caliper bracket threads.

This happens A LOT especially with rebuilds.

OTHERWISE, if you really can't just tell what a 12x1.25 thread pitch is by lookin at it, they you have not spent enough time around Nissans.

[ZOMG.SR20]

hit the caliper with a wire brush to get rid of the burrs or slag that was left behind from rebuilding them then try it

[YuNg1's_240sx]

Edit: scratch that problem.
Modified by YuNg1's_240sx at 12:16 AM 8/4/2009

[Karateboy88]

I was pretty sure it was the same thread but I didn't want to be wrong and f*** up my new aluminum threads.

I doubled checked and its the same part number for S14/Q45/J30 bolts.

Maybe I'm misunderstanding you: what is bur? From context, I'm picking up that the thread is the correct pitch but perhaps has a little slag in it. I don't see how a wire brush is going to fit into a 12mm hole.

My best idea is to either bolt it in or retap it.
Modified by Karateboy88 at 9:53 PM 8/3/2009

[AZ89two4Tsx]

Well, I guess the s13 mounting bolts are different from the s14 ones.

Sounds like s13 is the odd one out.

In that case, forget what I said.

[MisteenoMike]

When it comes to Z32 Aluminum calipers, make this your MANTRA.

Run a tap and die set on EVERY thread and bolt that will go anywhere near them. This is especially important if you tear the caliper apart to rebuild it. It's time consuming and slow but 100% worth it!

As a side benefit, tapping the holes will help you figure out the thread pitch of the mounting holes. (Which are not aluminum, they have steel inserts and should be 12 x 1.25) Only thing is it can be hard to find a metric set with the thread pitches you need, but well worth it if you do.
Modified by MisteenoMike at 12:47 AM 8/11/2009