Can I use regular bolts on my exhaust?
Are exhaust bolts special? Exhausts are not high stress areas so the bolts can be 8.8 or even softer. We used to use brass nuts on exhaust manifolds so the nut could be easily cut off in the unlikely event it seized. Grade 4.6, 4.8 or 5.8 should be all be fine.
Are all exhaust flange bolts the same?
The most common options of exhaust flanges are the 2 bolt or 3 bolt type but 4 bolt are also available. Generally you would use a m10 bolt with the 2 bolt option and a m8 bolt for the 3 bolt. The grade of bolts we recommend are a 8.8 tensile or higher so they can be tightened without breaking or stretching the bolts.
Do I need special bolts for headers?
For secure fitment, header bolts need maximum thread engagement, without bottoming out in the cylinder head. … Most headers with 1/4-inch or 5/16-inch thick flanges will use bolts with a 3/4-inch UHL, while 3/8-inch thick flanges normally require bolts with a 1-inch UHL.
Can I use stainless steel bolts for exhaust manifold?
There’s nothing wrong with them on exhaust systems but you really can’t put any serious torque on them because they are much lower tensile strength than alloy steel. They will stretch more so have to be tightened more than once after break in (in this application.
What type of bolts are best for exhaust?
Best is to go stainless. 316 class stainless best pairs to the load characteristics of the exhaust man bolts, but are difficult to find. Commonly accessible, but much pricier than regular alloy steel bolts, are ARP’s and the 17-4 PH bolts offered by RMS.
Can I replace exhaust stud with bolt?
Super Moderator. I agree, the bolts in place of studs and nuts would be okay. Be sure to observe the torque specs for the bolts, i.e. to be the same as the nuts on the studs. You dont want an exhaust manifold to be too tight – it interferes with the manifold expanding at a different rate than the head.
What is a Grade 8 fastener?
A grade 8 bolt is stronger than the more commonly used grade 5. It is made of alloy steel and has six radial lines on the top of the bolt head. Grade 8 bolts have a tensile strength of 150,000 pounds per square inch.
Are stainless bolts good for exhaust?
Re: Stainless bolts for exhaust manifolds
I’m 99.99999% sure they use stainless bolts on jet exhausts as it won’t react with the titanium like cad plated hardware will. If it works there, it should be FINE on an air cooled engine exhaust.
Why are exhaust nuts copper?
Copper exhaust nuts are not copper through and through, they’re steel nuts with a heavy copper plating and the last couple of threads are crimped slightly to grip the stud so they loosen off. I’ve had these nuts turn green in storage but never while on the car, I think the heat of engine prevents that.