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Unread 02-25-2014, 08:08 AM   #1
slightlycrazy
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What type of bolts to buy for homemade leaf shackles?

I planned on using 3/8" steel to make longer shackles but the stock bolts won't be long enough for them. I'm not sure using grade 8 because they the theit shear strength may not be up to snuff & that's the type of load it'll have. Anyone have input/suggestions?

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Unread 02-25-2014, 01:16 PM   #2
BESRK
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Grade 8 is fine for shackle bolts..
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Unread 02-25-2014, 02:21 PM   #3
thantos858
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Quote:
When no shear strength is given for common carbon steels with hardness up to 40 HRC, 60 % of their ultimate tensile strength is often used once given a suitable safety factor. This should only be used as an
estimation.
Grade 8 bolts have a minimum tensile strength of 150,000psi.

Like Besrk said grade 8 will be just fine.
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Unread 02-25-2014, 07:15 PM   #4
chet44
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That's what I used before I switched to M.O.R.E. shackles with the greaseable bolts. You may be able to buy a set of those bolts through M.O.R.E. Their shackles are 3/8" thick.
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Unread 02-26-2014, 01:21 PM   #5
slightlycrazy
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Cool. Needed reassurance. I've seen how grade 8 "snaps" and grade 5 "gives" and heat treatment etc. I'll hit tractor supply.
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Unread 02-26-2014, 04:01 PM   #6
BESRK
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A Grade 5 will fail before a Grade 8 even begins to bend..
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Guardrail

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Crozet

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