Bolt grade equivalents -
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post #1 of 4 Old 08-25-2002, 08:56 PM Thread Starter
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Question Bolt grade equivalents

After wrassling with the rusty bolts that hold on my front bumper, I decided that I wanted to replace them with stainless steel. The problem is I don't know if they make a SS bolt that is stronger than a grade 5. I have heard that 316 SS might be a grade 5, but that was just hearsay and I have no proof to back that up. Anybody have an idea where I can get a chart similar to SAE for SS (or even galvanized for that matter). Obviously I could just use larger diameter bolts, but I would rather do things the right way and find out exactly what I need. Anyway, if any of you have any good links or sources for the info I am seeking, I would greatly appreciate it. Thanks in advance!

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post #2 of 4 Old 08-25-2002, 10:35 PM
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These Guys might know?

These guys seem to be scientifically into their bolts and stuff.
Here is a link where you can ask them something.
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post #3 of 4 Old 08-26-2002, 08:44 PM
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Here's your solution, just go up one notch. No need to spend $$ on specialized parts.

Start using Grade-8 Bolts (6 Lines) You can find them at Lowes/Home Depot or even order through Grainger. They have a tensile strength of 150,000lbs, and usually gold/zinc plated and resist rust very very well. Also use Anti-sieze anytime you drop in bolts. These are very hard to break.

Stainless are the best for resisting rust, but are only equivilant to Grade 5, sometimes less. ( 110,000lbs)

Grade 5 are usually zinc coated and tend to rust quick, but still better than grade 2-3 or regular zinc bolts..

Hope this helps


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post #4 of 4 Old 08-30-2002, 09:13 PM Thread Starter
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I have been gone most of this week on travel so I haven't had a chance to check my email. The bolts that I removed originally were Grade 8 bolts and unless they changed how Grade 8 bolts are made, mine were very rusted. Cutting off two bolts took almost a whole cutting wheel (granted they were cheesy ones)! Anyway, from what I have read over in JU, Grade 5 bolts or higher are recommended for bumpers. All in all I have gotten conflicting reports from people I know and people I don't know. What I am sort of looking for is some sort of comparison charts on regular steel bolts (diff grades) and SS bolts. I guess a chart on tensile strengths would be a start, but how about torque values? Does that really matter in this application? I guess this is turning "bolts for dummies" thread...

Thanks in advance!

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