I think they're inconel or monel.

Dave

 

Who's Ray and where can I find these? The nuts I keep finding at Home Depo and OSH are the same size as the heads on the bolts that fit. I really need nuts that are small enough to screw onto the stud without hitting the bend on the DP. Would this be my solution? I couldn't even find metric studs at Home Depo or OSH. My best shot so far is Allen head bolts.

 

Ray Crowe is the parts manager at Malloy Mazda. He gives club members a very good price on Mazda RX-7 parts. 888-533-3400. The only issue is he's in Virginia - you might have better luck with Mazdatrix (http://www.mazdatrix.com/e7.htm is the page with exhaust hardware) since they're on the west coast and shipping will be faster.

As for hardware at this joint - I've literally tried them all. Mazda hardware is clearly the best. 2nd best might be a class 10.9 or 12.9 socket head cap screw with a split lock washer or other small washer under the head. You might need to grind the weld of the downpipe a little bit to give enough flat space for the nut or screw head to clamp well. Naturally don't overdo it or you'll break thru and cause a leak, but it's stainless and it takes a little while to dig just 1mm like I did.

Dave

 

Wow it's almost 10 bucks a stud from MazdaTrix! Unreal.

 

Why would anybody use a low spec Home Depot bolt/screw/nut. All bolts on a car are HS alloy steel. Also ASTM and SAE nuts are a larger size for a given bolt than japanese JIC nuts. The Japanese car companies pushed for weight reduction, just as the US aviation consortium did, thus nuts are smaller but of higher strength material.

Rather than comprimise the weld in the DP, why not just use socket head bolt/screws at least for that one though position. then to keep tools the same use the same for all. Also why risk getting studs stuck/broken by using then again. Just my pennys worth of thoughts

 

Let's get this terminology straight once and for all. All words refering to screws, nuts, bolts and studs must be preceded by the word "*******."

 

I think this thread is stripped.

 

Bringing This From The Dead.

If there is clearence issues, Why Not Go With a Low Head Socket Head Cap Screw

McMaster Car Part Number

93070A215