B5 rear caliper bolts

[Andyb5tdi]

This is the type currently fitted and the internal hex is very well worn. Does someone know of a better replacement, and/or what pitch/ thread they are and what grade material they should be

I'm thinking a standard hex head would be a more sensible idea.

Tia

Andy

 

[aragorn]

just buy new standard bolts from audi, they are a non-standard pitch and a specific length.

 

[S4_dan]

M10 x 1.25 x 20 is what Audi lists for those bolts on EPC. I'm after a couple myself.

Part number N0199123

 

[S4_dan]

The one you posted is 10.9 tensile. So anything the same or above should suffice.

 

[Andyb5tdi]

Thanks guys, it's not that I plan on taking them on and off every 5 mins, but an external hex would make more sense IMO

 

[aragorn]

its probably internal for clearance, and they work fine, so leave it alone

Replace the old rusty worn ones for nice fresh ones and job done.

 

[Andyb5tdi]

its probably internal for clearance, and they work fine, so leave it alone

Replace the old rusty worn ones for nice fresh ones and job done.

Maybe I could get them zinc plated?

 

[aragorn]

the factory bolts are galvanised

 

[Andyb5tdi]

But they still rust, maybe I'm growing too fond of my B5 in its old age

 

[S4_dan]

I've ordered some 12.9 m10 8mm allen hex bolts. Will let you know what they're like of Friday.

 

[aragorn]

Personally, i've found the factory coatings to be better than anything else.

BZP bolts rust in a few months on a car. If you fit new factory bolts, it will be YEARS before they rust again.

 

[spartacus 68]

When removing the rear allen hex bolts, always hammer in the hex-key first to dislodge any rust or corrosion so it sits snug. Poorly fitting hex-key will strip head as soon as you put pressure on it otherwise.

 

[Andyb5tdi]

Your spot on there, a shame the PO didn't lol

 

[matt66604]

Is it Quattro or FWD? For the FWD I use driveshaft bolts from newer A4,A6 etc.. same size bolts, but with a M12 multispline head.

N90441103 is the part number,

 

[Andyb5tdi]

It's a 1.9tdi so just fwd

 

[matt66604]

Aye my 1.8t FWD uses the newer A4 cv joint bolts, they’re spot on

 

[Andyb5tdi]

Cool, I'm guessing the tensile strength of the N90441103 are the same or higher than the original ones?

 

[matt66604]

Probably better than original I would guess. Could check the difference between the two torque settings for each bolt.. I’ve been running mine for 5 years plus with no issues, I had to come to replace mine because the originals where minced and looking about my old work (Audi dealer) one day for bolts I found spare driveshafts bolts and they’re perfect. Multispline instead of hex so less issues with rounding..

 

[Andyb5tdi]

Thanks Matt, got mine today £5.98 Inc vat

 

[matt66604]

No worries

 

[Andyb5tdi]

Just an update, I fitted the new bolts (without checking the thread, (my bad) and stripped one of the threads in the caliper bracket . I got a set of the
original type bolts from the dealer and have fitted them and coated the heads with copper slip to try to slow down the corrosion on the bolts .

The bolt on the left are the N90441103 (12point head, driveshaft bolts) and the one on the right is the OEM bolt N0199123

 

[S4_dan]

I purchased these and had no issues with the thread..... https://m.ebay.co.uk/itm/M10-x-1-25...m=231388117504&_trksid=p2056116.c100890.m2460

Have you got another caliper carrier?

 

[Andyb5tdi]

Yep all sorted now mate, now to do the front wheel bearing as the rear one didn't stop the noise lol