I ruined the old bolts when taking them off and I am in need of new ones for the studs that hold on the EGR stuff. I purchased the EGR block off plates and I am trying to locate the correct bolt size for the studs.

Thanks.

 

5/16"-18

 

Ok thanks, I went down to the local hardware store before I got your post and got some 5/16" nuts but it looks like the wrong thread size because they wont thread on like the old ones did. I guess I will head back.

Thanks for the info.

 

They are a metric thread. 4 mm by 1.5 I think, its the standard 4mm thread.

 

Not on mine.

 

Doh. Well I was able to get the standard 5/16 x 18 nut over the studs, however the flang style at 5/16 x 18 did not work. So I am not sure. I have 1 flang style that I salvaged from the removal of the EGR and it threads all the way down to the intake. The new 5/16 x 18 flang ones that I purchased from the store do not. They stop right as you get to the end of the nut and will not thread any deeper. I figure since the block off plates are aluminium the stainless steel 5/16 x 18 nuts will match so I will just use non flang style.

If anyone has anymore insite as to what style/size flang nut would work I would appreciate it. I just like to make sure everything is as stock looking as possible.

 

Your right mine won't fit a 4mm either because they are 8 by 1.25mm. I had a brain fart when I typed 4mm

8mm=.3149 inches
5/16=.3125 inches

They are very close in diameter as well as pitch
5/16-18 pitch =.055 inches
8by1.25pitch =.0492 inches

Sorry for the confusion

 

5/16-18 is spec'd in the parts book, plus the nuts are 1/2 wrench size. That pretty much makes them non-metric the way I see it.

 

Normally I would agree with ya shoebox, but I tried the 5/16 x 8 size flang size and they defiantly dont fit. I think the parts book is referring to a non flanged style or something. A normal 5/16 x 8 nut does fit however.

 

I didn't say 5/16 x 8.

All I said was the thread and pitch were 5/16-18. The nuts you choose are up to you.

 

it is 5/16" wide with 18 threads per inch thread pattern. Should not matter if it has a flange or not unless it is a locking nut. If it screws down most of the way, sounds like you have the wrong thread pattern

 

As far as the studs are concerned, what is the thread size for the part that is threaded into the intake? When I bought my intake for P/P, the studs had been removed. I have the blockoff plates and now need to know the thread size of the stud in the intake. Is the same size listed above?

97pontta, I really like your intake... bet that would look good with my polished valve covers .