I need two really long bolts...

I need two really long bolts.  I thought I'd look here for direction before filling out a bunch of online forms for custom hardware orders so I can get outrageous quotes in return (because who wants to make two bolts???)

The bolts I want will take a 5mm allen key, are 420mm long, and 5.8mm diameter at the shaft.  Head is 10mm in diameter, and 3mm thick.   Unknown thread pitch right now.  My pitch gauge is at home and probably buried in a moving box right now.

I'd like to know where the best place to go to find such a thing, or if it's even possible.  OR if I would be better off buying some hex stock and bribing someone with a lathe?

(no reading required but pictures are below)

Thanks guys.  Now for the TLDR part:


The idea is to take these GSXR throttle bodies....

and stick it on the end of the chrome runners on a Busso V6.

Thanks guys!
 

Looks like M6 x 1.  That's a long screw.

Is there any way you could use a stud and nut instead?  Bolts that long will be hard to come by, but you can buy threaded rod and cut it to length if you can deal with having it fully threaded.

I can't help with the bolts (although I completely approve your plan), but... is that really a 50 meter measuring tape??  What's it weigh, like, 5 pounds?

5.8mm, sure it's not an M6? What's the diameter at the threads?

Mcmaster doesn't carry anything past 200mm. I'd echo the suggestion above and use a stud.

https://www.mcmaster.com/#studs/=1b4x94e

They have em up to 500mm. Cut it to length, bam, done.

The only hard part is the allen head, if it is supposed to go into a recess.  Is there enough meat to open it up to accept a nut and socket, or a spacer that will allow the nut to be proud of the casting?

Someone with a lathe and should be able to turn some 3/8" or 10mm diameter stock into what you want fairly easily, except for the socket head part. That would be easier to do an 8mm external hex, with a 10mm integral flange.

It is an M6 

I thought the M8 designation sounded weird, given the dimensions...

The threaded rod is genius!  do you think it'd chew up the holes at all, being mounted on an engine?

failing that, if I go hex stock (I wouldnt worry about the allen key requirement.  it was just the ideal scenario)  would something like 304 stainless work?

If those bolts are intended to hold the throttle bodies together I'd try cutting them in half and welding in a chunk of metric rod. Smooth the welds down and try them. Second try would be threading both ends of some metric rod.

I'd try cutting them in half and welding in a chunk of metric rod

I did just that to respace the bike carbs I'm using.  The carbs use a stud with nuts to hold them together.  

Buy rod material and thread the ends, either internal or external.

M6 threaded rod, grade 12.9?  Make one.

Google up M6 All Thread.

I did this exact thing to build ITBs for an old BMW 2002 project.

I used allthread to hold the TBs together and it worked great!

Stealthtercel said:

I can't help with the bolts (although I completely approve your plan), but... is that really a 50 meter measuring tape??  What's it weigh, like, 5 pounds?

i think the tape weighs about .0787 stone, but yeah!  it is a 50-meter tape 

i just looked up allthread.  it's definitely the easy button here.  bonus points for being able to buy grade 12.9 heat treated metric rod.

thanks guys!

Well, I guess while you're waiting for the allthread to arrive you could always go out and do road surveying or something.

Zinc plated Grade 8 allthread (m6-1.00, 1 meter long, 4ea) = $5

Grade 8, zinc plated nyloc nuts (m6-1.00) box of 100 = $2.14

zinc plated steel washers (m6) boc of 100 = $2.70

That was way to cheap and easy for comfort (I was shooting for grade 12.9 but was having trouble.  Grainger didn't have grade 10 with zinc plating, hence the grade 8 choice above)

Thanks everyone!

Class 12.9?!?

Holy balls man! What kind of forces are you imagining are trying to spread some throttle bodies?

I was also curious about the load. 

I was actually thinking something like a solid smooth rod with a groove machined in the ends for an e-clip. 

Then source/make a couple springs to go into the recesses. 

It's not very practical, but it would look cool. 

Jumper K Balls said:

Class 12.9?!?

Holy balls man! What kind of forces are you imagining are trying to spread some throttle bodies?

Hey, anythin work killin is worth overkillin

Not too worried about it.  Grade 12.9 was mentioned in the thread so I spent a little time looking for it. 

 

Now to look at ideas for filtration...

Hungary Bill said:

It is an M6 

 

I thought the M8 designation sounded weird, given the dimensions...

 

The threaded rod is genius!  do you think it'd chew up the holes at all, being mounted on an engine?

 

failing that, if I go hex stock (I wouldnt worry about the allen key requirement.  it was just the ideal scenario)  would something like 304 stainless work?

Maybe a small tube (copper, stainless, PVC, whatever), with allthread inside for the best of all worlds.

Maybe just get a 6mm solid rod and use a die to thread an inch or so of each end for a nut.