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Old 09-21-2018, 02:58 PM   #1
cityhawk
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Default Exhaust manifold flange studs

A few years back, when one of my exhaust manifold flange studs was stripped, I took Rozzie (1993 SW2) to a local Meineke muffler shop to extract and replace them. They did so, but replaced them with bolts, which keep loosening and causing exhaust leaks at the flange.

Anyway, for convenience, I'd like to replace these with stainless steel studs. Does anyone know offhand what size and thread these are?

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Old 09-21-2018, 09:20 PM   #2
billr
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Default Re: Exhaust manifold flange studs

Those are M8 x 1.25

However, I gotta ask... did they save the threads in the manifold flange? I'm confused because you said they installed "bolts" and that would require a clearance hole in the manifold (wiping out the stock threads). If the threads in the manifold were saved, then only screws (or studs) could be in there.

Yes, folks, threaded fasteners are properly called "screws" or "bolts" depending how they are installed. Fastener size or head style has little-to-nothing to do with the screw vs. bolt difference.

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Old 09-22-2018, 09:01 AM   #3
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Default Re: Exhaust manifold flange studs

For some reason, youre never supposed to mix stainless steel and aluminum.
As an alternative, if you use longer bolts and stack a bunch of washers, the bolt will act as a spring and hold clamping force.

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Old 09-22-2018, 10:11 AM   #4
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Default Re: Exhaust manifold flange studs

It is a cast iron exhaust manifold to SS is OK. If you want it to last use SS nuts and washers. To be able to take it apart use nickle based antiseize. Stacking washers is a good idea or high temp belleville washers to do it right.

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Old 09-22-2018, 01:51 PM   #5
Bruce Rock
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Default Re: Exhaust manifold flange studs

Quote:
Originally Posted by billr View Post
Those are M8 x 1.25

However, I gotta ask... did they save the threads in the manifold flange? I'm confused because you said they installed "bolts" and that would require a clearance hole in the manifold (wiping out the stock threads). If the threads in the manifold were saved, then only screws (or studs) could be in there.

Yes, folks, threaded fasteners are properly called "screws" or "bolts" depending how they are installed. Fastener size or head style has little-to-nothing to do with the screw vs. bolt difference.
My exhaust manifold has clearance holes. The head is threaded for the studs used to secure the exhaust manifold.

While I seldom use the term "bolt" it's unlikely one using that term is referring to something used in wood.


"Differentiation between bolt and screw

There is no universally accepted distinction between a screw and a bolt. A simple distinction that is often true, although not always, is that a bolt passes through a substrate and takes a nut on the other side, whereas a screw takes no nut because it threads directly into the substrate (a screw screws into something, a bolt bolts several things together). So, as a general rule, when buying a packet of "screws" nuts would not be expected to be included, but bolts are often sold with matching nuts. Part of the confusion over this is likely due to regional or dialectical differences. Machinery's Handbook describes the distinction as follows:

A bolt is an externally threaded fastener designed for insertion through holes in assembled parts, and is normally intended to be tightened or released by torquing a nut. A screw is an externally threaded fastener capable of being inserted into holes in assembled parts, of mating with a preformed internal thread or forming its own thread, and of being tightened or released by torquing the head. An externally threaded fastener which is prevented from being turned during assembly and which can be tightened or released only by torquing a nut is a bolt. (Example: round head bolts, track bolts, plow bolts.) An externally threaded fastener that has thread form which prohibits assembly with a nut having a straight thread of multiple pitch length is a screw. (Example: wood screws, tapping screws.)[2]

This distinction is consistent with ASME B18.2.1 and some dictionary definitions for screw[3][4] and bolt.[5][6][7]

The issue of what is a screw and what is a bolt is not completely resolved with Machinery's Handbook distinction, however, because of confounding terms, the ambiguous nature of some parts of the distinction, and usage variations.[8][not in citation given] Some of these issues are discussed below: Bolt vs Screw"

You must have gone to this school:

"Though many times confused by amateurs, bolts and screws are different types of fasteners. Bolts are headed fasteners with external threads suitable for non-tapered nut. They require a nut (or some other thread) as a counter - to lock the joint. The bolts are made with uniform threads satisfying the standard specifications such as UNJ, UNR, MJ etc. and are used in most industrial applications secured with a spring-washer or a locktite. To sum it up, bolts are designed to use as a fastener placed through already drilled holes in the machine parts and these requires a nut to tighten it from the other end.

Screws are headed externally threaded types of fasteners without meeting the standard specifications of the bolts. They are shafts with provision at one end to turn the screw and have a helical thread on its surface, which is capable of piercing strongly into the surface. They do not require a nut and are used mostly in home-based application such a connecting a picture to the wall. It is actually the simplest example of converting torque into linear force"

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Old 09-22-2018, 02:07 PM   #6
OldNuc
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Default Re: Exhaust manifold flange studs

Few people read or have ever heard of "Machinery Handbook" so they would be unaware of the information you posted.

Industrial supply houses have their own definition.

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