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Old 08-16-2019, 10:12 AM #1
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Exhaust bolt size question

I have a new muffler and tail pipe to install.

Does anyone happen to know the size nuts you need for two o2 sensor studs?

I believe they are M8x1.25? I want to stop at the hardware store on my way home from work and get some stainless nuts.

Also, I forgot to measure the flange bolt hole size this morning before work. I also want to get some stainless bolts/nuts.

I called my wife and had her measure the ID of the bolt holes on the two flanges (muffler to cat, muffler to tail pipe) and she got a reading of about "1/2" with my digital caliper.

Does that sound right? If so, should I get 1/2" bolts or does someone know for sure what size bolt to use.

BTW, like an idiot, I bought another Walker muffler/tail pipe and fully anticipate on replacing it again in 2.5 years assuming my truck has rusted in half before then.
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Old 08-16-2019, 04:13 PM #2
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I measured the diameter of a new bolt that goes into the flange and it is 9.91 mm (0.39 inches)
Length of the threaded part of the bolt is 36 mm (1.417 inches)

25.4 mm = 1 inch

Socket is 14 mm

Bolt flange = 90080-10064
Nut: 90080 - 17187
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Old 08-17-2019, 01:16 AM #3
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Quote:
Originally Posted by nissanh View Post
I measured the diameter of a new bolt that goes into the flange and it is 9.91 mm (0.39 inches)
Length of the threaded part of the bolt is 36 mm (1.417 inches)

25.4 mm = 1 inch

Socket is 14 mm

Bolt flange = 90080-10064
Nut: 90080 - 17187
That would be an M10x1.25. If the first two digits of the second half of the p/n are 10 or 08, say, then those are M10 or M8. Same for many nuts and washers. Toyota only uses one thread pitch for each diameter:

Quote:
6mm diameter - 1 mm pitch (iso course) - requires 10 mm wrench to fit head / nut
8 mm diameter - 1.25 mm pitch (iso course) - requires 12 mm wrench to fit head / nut
10 mm diameter - 1.25 mm pitch (iso fine) - requires 14 mm wrench to fit head / nut
12 mm diameter - 1.25 mm pitch (iso other) - requires 17 mm wrench to fit head / nut
14 mm diameter - 1.5 mm pitch (iso fine) - requires 19 mm wrench to fit head / nut
16 mm diameter - 1.5 mm pitch (iso fine) - requires 22 mm wrench to fit head / nut
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Last edited by TheDurk; 08-17-2019 at 01:21 AM.
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