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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Initially Posted - 10/30/2007 :  23:12:29  Show Profile  Visit delliottg's Homepage
Some of the bolts I've been cutting off of my trailer are marked with a large 5 on the head. I haven't been able to find any sites out there that tell me what a 5 means. I'm sure it's a hardness grade, and I want to make sure to replace them with similar grade bolts. Do any of you know what the 5 means? Just to stave off some questions, it's the numeral 5 not six hash marks like you'd see on a grade 8 bolt.
David
C-250 Mainsheet Editor


Sirius Lepak
1997 C-250 WK TR #271 --Seattle area Port Captain --
Edited by - delliottg on 10/30/2007 23:21:49

OLarryR
Master Marine Consultant

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USA
3370 Posts
Response Posted - 10/31/2007 :  05:55:29  Show Profile  Visit OLarryR's Homepage
I could not find a marker identification "5" but if it has 3 lines on it radiating out half-way from the center to the outside on the bolt head, then it is a carbon steel bolt with a 105,000 to 120,000 psi tensile strength. (But the bolt identification tables I looked at did not show a "5" designated on the head. just the lines to denote tensile strength. Some bolts do have identification letters and numbers denoting matl such as SS.)
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 10/31/2007 :  08:41:28  Show Profile  Visit delliottg's Homepage
Larry,
Thanks for the response. They just have a single "5" on the heads, no lines. I suspect they're old bolts, but I don't know that for sure.
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Ed Cassidy
Captain

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USA
365 Posts
Response Posted - 10/31/2007 :  09:11:50  Show Profile
Perhaps metric? The bolts on my Isuzu all have numbers, 8,10.5 etc.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 10/31/2007 :  15:08:11  Show Profile
Certainly isn't a standard marking (at least by current standards).
As speculated, it could be an archaic marking for Grade 5.

As an alternative thought, how long are the bolts? Are they 5"?

I use 316 stainless or hot-dip galvanized on all my trailer bolts.
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 10/31/2007 :  15:37:59  Show Profile  Visit delliottg's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">As an alternative thought, how long are the bolts? Are they 5"? <hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

No, these are the hated 1-1/2" x 1/2" bolts they put inside the tubes so you can't get a wrench on them or adjust them. I'm going to replace them with 3-1/2" or 4" bolts, I just want to make sure the replacements are the correct grade.
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Nautiduck
Master Marine Consultant

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Response Posted - 10/31/2007 :  20:45:21  Show Profile
The number "5" on a bolt is an indicator that, if replaced, the replacement bolts should be stainless steel.
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Steve Blackburn
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Canada
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Response Posted - 11/02/2007 :  10:23:47  Show Profile  Visit Steve Blackburn's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by delliottg</i>
<br />Some of the bolts I've been cutting off of my trailer are marked with a large 5 on the head.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Maybe the "5" means, do not cut?
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