Name that stud: Stock Turbo Exhaust "Brick" Edition
 

Hi gang,

Trying to figure out the studs needed for "the Brick" - I know there are only 2 different thread sizes, but I noticed that the studs are all different lengths. I checked the factory service manual but I can't seem to find it. I also searched, but people only talk about the thread size (never the length)... I know the sizes are either M10x1.5 or M8x1.25 but I don't know all the specific lengths.

So here we go...let's play NAME THAT STUD!

I've lettered-off all the studs in the pic (ignore the broken one...haha) so lets see who can list the thread size, pitch & length of the stud that is supposed to go in each hole...

Letter | Thread Size | Thread Pitch | Stud Length
A | 10mm | 1.5 | _____?
B | 8mm | 1.25 | _____?
C | 8mm | 1.25 | _____?
D | 10mm | 1.5 | _____?
E | 10mm | 1.5 | _____?
F | 10mm | 1.5 | _____?
G | 10mm | 1.5 | _____?
H | 10mm | 1.5 | _____?

https://www.rx7club.com/attachment.p...1&d=1307468853

I think this will be a good thread to be archived.

AEFDH are all the same stud/nut. C is the smaller through bolt and BG are the larger through bolts.

Haha ok yes I know that much, I am trying to figure out the stud lengths.

pfft, i didn't really want to dig out a set of bolts to measure as you can just measure the turbo flange thickness... but ok.

AEFDH = 35.5mm 10X1.5mm
BG = 68.75mm 10X1.5mm(these are bolts not studs)
C = 32.5mm 8X1.25mm(sometimes this is a factory bolt, sometimes a stud/nut)

Thanks. I'm sure this will help other people who happen to search for this info also.

I recently replaced mine on a rebuild, and noticed that the old ones were a shorter length than the replacements I ordered through Ray. (both the old and new ones were OEM iconel or whatever it's called)

confused me at first but there were no fitment issues with the longer studs, and I have a RHD.

Unfortunately I don't have any of them laying around anymore to measure for you.

Placed my order with McMaster-Carr. I also ordered studs for the brick-to-block, and I ordered an extra of each one just to be safe.

• A,D,E,F,H | 98867A350 | Metric Black Class 8.8 Steel Spacing Stud M10 Size, 37mm Overall Length, 1.5mm Pitch | Quantity 6 | $0.81 Each | Total $4.86
• B,G | 98867A360 | Metric Black Class 8.8 Steel Spacing Stud M10 Size, 72mm Overall Length, 1.5mm Pitch | Quantity 3 | $1.28 Each | Total $3.84
• C | 98867A315 | Metric Black Class 8.8 Steel Spacing Stud M8 Size, 35mm Overall Length, 1.25mm Pitch | Quantity 2 | $0.48 Each | Total $0.96
• Brick-to-Block | 98867A355 | Metric Black Class 8.8 Steel Spacing Stud M10 Size, 62mm Overall Length, 1.5mm Pitch | Quantity 5 | $1.18 Each | Total $5.90

The 4 OEM ones for the downpipe were the same size as A,D,E,F,H FWIW if you're ordering those as well.

I ordered those awhile back so I already have them on hand. :icon_tup:

Do you know where I can get the corresponding nuts?

I personally don't need the info but thank you Theorie for once again contributing to the community knowledge base!

I've gotten a few PMs from people due to my build thread asking for stud sizes and where I got them. Just wanted to update the thread with a follow up that includes everything in one post.

Here is everything you'll need to re-stud the stock turbo stuff:

For the brick. See the photo in the 1st post for letter codes:

• A,D,E,F,H | 98867A350 | Metric Black Class 8.8 Steel Spacing Stud M10 Size, 37mm Overall Length, 1.5mm Pitch | Quantity 5 | $0.81 Each
• B,G | 98867A360 | Metric Black Class 8.8 Steel Spacing Stud M10 Size, 72mm Overall Length, 1.5mm Pitch | Quantity 2 | $1.28 Each
• C | 98867A315 | Metric Black Class 8.8 Steel Spacing Stud M8 Size, 35mm Overall Length, 1.25mm Pitch | Quantity 1 | $0.48 Each

For the 4 studs that bolt the brick to the engine block:

• 98867A355 | Metric Black Class 8.8 Steel Spacing Stud M10 Size, 62mm Overall Length, 1.5mm Pitch | Quantity 4 | $1.18 Each

For the downpipe:
You can use 4 of the M10x1.5 that are 37mm long (same as A,D,E,F,H on the brick). Part number 98867A350

You'll also want washers. I used these (sold by the bag):

• 91166A280 | Din 125 Zinc-plated Class 4 Steel Flat Washer, M10 Screw Size, 20mm Od, 1.8mm-2.2mm Thick | $3.98 per pack of 100

For the copper lock nuts I used:

• PM33629 | M10-1.5 Exhaust Lock Nut Copper Plated Steel 14mm Hex | $12.30 per pack of 25
• PM33627 | M8-1.25 Exhaust Lock Nut Copper Plated Steel 12mm Hex | $15.82 per pack of 25

My brick all re-studed (I actually had to use one different stud because my brick had been heli-coiled, but you get the idea...):
http://gallery.tfrascone.net/var/alb...3/IMG_6330.jpg

Thank you very much for the follow up and great information. This should not only be stickied for the info inside, but also as an example of how to make a great informational thread.

Out of curiosity, why did you decide to go this way rather than OEM? Obviously they are much cheaper than stock. However, the OEM bolts are made from Inconel, which is a better material for dealing with the heat generated by the turbos. Based on the number of broken studs out there, they aren't perfect, but I'm curious to see how regular steel holds up over several years and if they stretch or weaken after a couple hundred heat cycles.

Worked like a champ. :icon_tup::icon_tup: