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Old 02-26-2019, 10:50 AM   #1 (permalink)
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What bolt grade to use for Heims?

Hey all,
Im currently setting up my crossover steering with Heims. Im wondering what the recommended grade of 3/4in bolt to be used? Grade 8, Grade 5, High tensile Stainless, etc... I did a search and could find much specific about the bolts so figured Id just ask.
Thanks

Last edited by chevyguy_72; 02-26-2019 at 10:51 AM.
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Old 02-26-2019, 11:09 AM   #2 (permalink)
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Old 02-26-2019, 11:09 AM   #3 (permalink)
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Grade 8
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Old 02-26-2019, 11:50 AM   #4 (permalink)
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Grade 8 or better. Usually racing is grade 9 or F911. At local bolt and fastener suppliers. They are generally 15-20% stronger than a grade 8. And probably regulated closer than a hardware store Grade8.

Some subscribe to the bending vs breaking scenario but F9 is usually the go-to as clamping means something also. Especially if using spacers or mis-alignments.

https://www.fastenal.com/content/fed...0Gr8%20Gr9.pdf

Most OEM front end bolts and studs are probably made to the F911 specs.

And sometimes Fronts take a beating. When first designing steering racks into independent front 4wd suspensions (Ultra4). 4 ea, 3/4" grade 8 bolts were breaking. Now the racks are keyed to the frames and F911 bolts used.
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Old 02-26-2019, 12:47 PM   #5 (permalink)
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Grade 8 fine thread with nylon lock nuts has worked for me.
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Old 02-26-2019, 01:24 PM   #6 (permalink)
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Thanks for all the replys... Im looking for strength so i will prob look into the grade 9 bolts.
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Old 02-26-2019, 02:03 PM   #7 (permalink)
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12 point head aircraft grade if you're a cool kid
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Old 02-26-2019, 02:12 PM   #8 (permalink)
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Quote:
Originally Posted by chevyguy_72 View Post
Hey all,
Im currently setting up my crossover steering with Heims. Im wondering what the recommended grade of 3/4in bolt to be used? Grade 8, Grade 5, High tensile Stainless, etc... I did a search and could find much specific about the bolts so figured Id just ask.
Thanks
be sure to shank the bolt as well.
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Old 02-26-2019, 02:27 PM   #9 (permalink)
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be sure to shank the bolt as well.
What do you mean by that?
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Old 02-26-2019, 02:30 PM   #10 (permalink)
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What do you mean by that?
correct length for non threaded area of bolt
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Old 02-26-2019, 02:32 PM   #11 (permalink)
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correct length for non threaded area of bolt
Got ya... yeah that makes sense...
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Old 02-26-2019, 02:43 PM   #12 (permalink)
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Got ya... yeah that makes sense...
if youre a super cool kid you get all those measured, counted and ordered from the airplane store and cry when you cant pay rent the next week
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Old 02-26-2019, 02:54 PM   #13 (permalink)
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if youre a super cool kid you get all those measured, counted and ordered from the airplane store and cry when you cant pay rent the next week
Funny... As soon as you mentioned it earlier i text my buddy who is an airplane mechanic... He said they didnt have any that big... but would have snagged some for me if he did...

Where do you source yours from?
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Old 02-26-2019, 03:11 PM   #14 (permalink)
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Funny... As soon as you mentioned it earlier i text my buddy who is an airplane mechanic... He said they didnt have any that big... but would have snagged some for me if he did...

Where do you source yours from?
psh i aint no cool kid, i dont use that shiz!

my plane mechanic buddy knows a few places, i can ask him if youre dead set on being
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Old 02-26-2019, 03:21 PM   #15 (permalink)
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psh i aint no cool kid, i dont use that shiz!

my plane mechanic buddy knows a few places, i can ask him if youre dead set on being
No thats ok... Ill prob stick with Grade 8 or 9
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Old 02-26-2019, 03:27 PM   #16 (permalink)
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psh i aint no cool kid, i dont use that shiz!

my plane mechanic buddy knows a few places, i can ask him if youre dead set on being
https://www.coastfab.com/

i priced a 3/4x5" bolt, nut, and washers was in the $110 range
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Old 02-26-2019, 03:29 PM   #17 (permalink)
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Old 02-26-2019, 03:32 PM   #18 (permalink)
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Would advise a aircraft bolt? something in a 501 with limited thread on end.

If you are in the socal area I can suggest several places you can purchase them.

They will ship also so no worries about getting them.

Post the size diameter and length you need and I should be able to source it.

I worked at Lockheed aircraft (Burbank Calif) earlier in my existince on this rock, still have some contacts on sources.
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Old 02-26-2019, 03:37 PM   #19 (permalink)
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i priced a 3/4x5" bolt, nut, and washers was in the $110 range
Ouchy
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Old 02-26-2019, 03:38 PM   #20 (permalink)
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Would advise a aircraft bolt? something in a 501 with limited thread on end.

If you are in the socal area I can suggest several places you can purchase them.

They will ship also so no worries about getting them.

Post the size diameter and length you need and I should be able to source it.

I worked at Lockheed aircraft (Burbank Calif) earlier in my existince on this rock, still have some contacts on sources.
I will do some measuring tonight...
Thanks
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Old 02-26-2019, 03:51 PM   #21 (permalink)
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GET TANKED!
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Old 02-26-2019, 09:01 PM   #22 (permalink)
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I’m gonna go out on a limb and say a 3/4” Grade 8 bolt has a tensile strength greater than the tie rod stand off it will be mounted to.

But I’m not very smart.

I’d set it up single shear with a piece of rusty all thread I found in the ditch and hope for the best.
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Old 02-26-2019, 09:50 PM   #23 (permalink)
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A Unbrako and other allen head bolt mfgs are essentially a Grade 9/ 911 also. GRADE 8 IS 150-160K PSI tensile and Unbrako is 180-190,000psi. Ebay is your friend.
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Old 02-27-2019, 05:21 AM   #24 (permalink)
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Run the numbers. For a given strength grade 8 in a larger size is probably cheaper than a higher grade bolt. You can always upgrade to the fancy bolt in the larger size if you do manage to break the grade 8.
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Old 09-26-2019, 11:55 AM   #25 (permalink)
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Grade 8 is what ive used, im not jumping it or anything crazy but i havent broken a bolt.
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