Rear calliper carrier bolts

[Chiggy_V]

Hi All,

Does anyone know what the bolts are that connect the carrier to caliper?

I may have stripped the thread in the calliper and I want to make sure I get the right thread pitch to repair it

Thank you

 

[MRBILLYUK]

Hi All,

Does anyone know what the bolts are that connect the carrier to caliper?

I may have stripped the thread in the calliper and I want to make sure I get the right thread pitch to repair it

Thank you

Did you manage to sort out the caliper carrier bolts?
I'm looking to replace mine but can't find the exact size. I thought they were M12 x 25mm x 1.25 thread pitch, but having visited a local tool distributor today to get some new bolts they didn't have any and didn't know the exact size.

 

[Mr Underhill]

They're a special bolt from Renault. See this thread here - https://cliosport.net/threads/nuts-and-bolts.814078/#post-11524905

The bolt shank (the unthreaded part) is designed to work with the anti-rotation plate so it aligns properly.

Like Scott, I ended up reusing my old ones.

 

[Chiggy_V]

Hi,

Yeah, in the end I used a set of callipers to measure the bolt and went with an M12x1.25 helicoil kit and bought a bold to suit
It worked and there has been no issues with the brakes.

I did buy some second hand rear callipers to rebuild as a long term project

 

[MRBILLYUK]

They're a special bolt from Renault. See this thread here - https://cliosport.net/threads/nuts-and-bolts.814078/#post-11524905

The bolt shank (the unthreaded part) is designed to work with the anti-rotation plate so it aligns properly.

Like Scott, I ended up reusing my old ones.

They're the 2 bolts that go in here. Not the 2 bolts that bolt the caliper to the hub.
Looking on that list from the link you posted it doesn't show any of those bolts. They're about 25mm long.

 

[Mr Underhill]

They're the 2 bolts that go in here. Not the 2 bolts that bolt the caliper to the hub.
Looking on that list from the link you posted it doesn't show any of those bolts. They're about 25mm long.View attachment 1702638

Ah sorry, my bad.

Part number - 7701025057

From the parts catalogue

VIS DI=12 L0=25

“VIS" is French for bolt or screw. "DI" stands for diameter, so DI=12 means the bolt has a 12 mm diameter. "L0" stands for length, so L0=25 means the bolt is 25 mm long.

There’s no specific information about the pitch, but I’d guess it’s a coarse thread with a pitch of 1.75 mm, which is standard for an M12 bolt. If the pitch were different, it would usually be specified.

Do you have a tap and die set? You could try a few taps to determine the pitch. I’ll have mine at the house tomorrow, so I can check a bolt for you if you haven’t figured it out by then.

Let me know if you need any more help!

 

[Mr Underhill]

Something like that - https://www.westfieldfasteners.co.u...ull_Thread_M12x25_Bright_Zinc_Plate_10.9.html

The metal is quite soft there which is why I think it’s 1.75mm. I can check pitch tomorrow though.

 

[MRBILLYUK]

Ah sorry, my bad.

Part number - 7701025057

From the parts catalogue

VIS DI=12 L0=25

“VIS" is French for bolt or screw. "DI" stands for diameter, so DI=12 means the bolt has a 12 mm diameter. "L0" stands for length, so L0=25 means the bolt is 25 mm long.

There’s no specific information about the pitch, but I’d guess it’s a coarse thread with a pitch of 1.75 mm, which is standard for an M12 bolt. If the pitch were different, it would usually be specified.

Do you have a tap and die set? You could try a few taps to determine the pitch. I’ll have mine at the house tomorrow, so I can check a bolt for you if you haven’t figured it out by then.

Let me know if you need any more help!

If you could check it would be much appreciated.
I ran a M12 x 1.25 die down a couple of the bolts just to clean them up but it removed a bit of material so I stopped. They are a fine thread. I'll be surprised if they're a 1.75 pitch. I've read a bit about the bolts, there's not much info to be honest but some people said they are 1.25 pitch which they obviously aren't.
The place I went to today is a well known tool distributor that sells more or less every nut and bolt under the sun and even they were baffled and couldn't help.

 

[Mr Underhill]

If you could check it would be much appreciated.
I ran a M12 x 1.25 die down a couple of the bolts just to clean them up but it removed a bit of material so I stopped. They are a fine thread. I'll be surprised if they're a 1.75 pitch. I've read a bit about the bolts, there's not much info to be honest but some people said they are 1.25 pitch which they obviously aren't.
The place I went to today is a well known tool distributor that sells more or less every nut and bolt under the sun and even they were baffled and couldn't help.

Definitely won’t be 1.25 pitch. The material is too soft. 1.75 is the standard and always used on soft materials as the threads are deeper and more robust.

Hopefully the die hasn’t damaged the threads 🤞🏻

 

[MRBILLYUK]

Definitely won’t be 1.25 pitch. The material is too soft. 1.75 is the standard and always used on soft materials as the threads are deeper and more robust.

Hopefully the die hasn’t damaged the threads 🤞🏻

It was just the first few threads 🤞

 

[Mr Underhill]

I removed the bolt for you and was surprised to find that the thread pitch was 1.5 mm instead of the standard 1.75 mm for a typical M12 hex bolt.

It's worth noting that my calipers are not the original ones but an aftermarket equivalent from Febi Bilstein.

It's possible the original bolts are M12 x 25 mm x 1.75 mm. Otherwise, the different pitch would be noted in the bolt's technical details. At least we've ruled out the 1.25 mm pitch. Bolts are inexpensive, so it won't hurt to buy both thread types.

 

[MRBILLYUK]

I removed the bolt for you and was surprised to find that the thread pitch was 1.5 mm instead of the standard 1.75 mm for a typical M12 hex bolt.
View attachment 1702843View attachment 1702844View attachment 1702845View attachment 1702846

It's worth noting that my calipers are not the original ones but an aftermarket equivalent from Febi Bilstein.

View attachment 1702847

It's possible the original bolts are M12 x 25 mm x 1.75 mm. Otherwise, the different pitch would be noted in the bolt's technical details. At least we've ruled out the 1.25 mm pitch. Bolts are inexpensive, so it won't hurt to buy both thread types.

Cheers mate 👍 I've ordered a thread pitch gauge. It should arrive today.
I found another rear caliper with different bolts in again lol. Im not exactly sure where I got this one from, I've had it years.
The calipers I've refurbed are genuine Renault ones that originally came on my 182. Hopefully the bolts are 1.5mm pitch cos they're cheap as chips and I'll ordered some new ones.
I'll let you know what size they are exactly when I've measured them 👍

 

[MRBILLYUK]

I removed the bolt for you and was surprised to find that the thread pitch was 1.5 mm instead of the standard 1.75 mm for a typical M12 hex bolt.
View attachment 1702843View attachment 1702844View attachment 1702845View attachment 1702846

It's worth noting that my calipers are not the original ones but an aftermarket equivalent from Febi Bilstein.

View attachment 1702847

It's possible the original bolts are M12 x 25 mm x 1.75 mm. Otherwise, the different pitch would be noted in the bolt's technical details. At least we've ruled out the 1.25 mm pitch. Bolts are inexpensive, so it won't hurt to buy both thread types.

Just to confirm what you told me.
Mine are M12 x 1.5mm thread pitch.

Thanks 👍

 

[Mr Underhill]

Just to confirm what you told me.
Mine are M12 x 1.5mm thread pitch. View attachment 1703100
Thanks 👍

Result! 😃