stainless bolt strength questions.. - Defender Source
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  #1  
Old June 14th, 2014, 09:42 AM
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Kevin C. Doyle
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stainless bolt strength questions..

Well, the headliner shop called and said the headliner is done. I'll go pick up the 90 in a few days, re install rear trim, seats, etc. I was going to just buy stainless bolts at the local hardware store, ACE, which does have an incredible assortment, but started thinking about the "strength" of the actual bolts that hold down the rear seat "anchors".

Does it matter? Would the force necessary in a wreck, if someone were in that seat, to rip the head off of the bolt be something less than what it would take to just pull the whole damn thing through the aluminum? I know that the seat belts are anchored in other places so does it just make my question idiotic? I keep reading about "Grade 8" etc and was just wondering if I'm making a mistake by using stainless for its obvious qualities.

FWP, I know

KCD
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  #2  
Old June 14th, 2014, 10:12 AM
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Dennis Lynch
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There's a thread here from few years ago about using stainless on the roll cages. If you do a little more digging here, you might find it.

Found it. There might be some valuable information here.
http://www.defendersource.com/forum/...ight=stainless
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  #3  
Old June 14th, 2014, 10:27 AM
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Just a thought here, if the seat pulls loose but the belt holds you will have that much more force above your body weight pushing you against the seat belt in the initial impact. Then if the seat is loose you are much more likely to sustain injury if the vehicle continues to move such as in a rollover.
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Old June 14th, 2014, 10:42 AM
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You can get grade 8 stainless...but it can get pricey.
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  #5  
Old June 14th, 2014, 11:20 AM
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Quote:
Originally Posted by ranewman View Post
You can get grade 8 stainless...
"Grade 8" technically refers to SAE J429 specification, which are not stainless. But, yes, you can get high strength stainless fasteners and, yes, they are relatively expensive.
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Old June 14th, 2014, 11:23 AM
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there are limitless combinations of stainless steel and heat treatments. afaik sae grade 8 is for cad plated non stainless steels only.

ace hardware sells 18/8 fasteners only which have very low tensile and yield strength.

rough stainless equivalent to grade 8 is 17-7 ph condition a and condition c completely exceeds grade 8.

in other words, stainless steels can have much higher stengths than grade 8. you will not find these fasteners at ace. try fastenal, mcmaster, or others online.
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  #7  
Old June 14th, 2014, 11:23 AM
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Quote:
Originally Posted by slorocco View Post
Just a thought here, if the seat pulls loose but the belt holds you will have that much more force above your body weight pushing you against the seat belt in the initial impact. Then if the seat is loose you are much more likely to sustain injury if the vehicle continues to move such as in a rollover.
^^ what he said. ^^

I would not substitute what the engineers required for fasteners in something so critical.


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  #8  
Old June 14th, 2014, 11:52 AM
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Kevin C. Doyle
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Quote:
Originally Posted by lynchee View Post
There's a thread here from few years ago about using stainless on the roll cages. If you do a little more digging here, you might find it.

Found it. There might be some valuable information here.
http://www.defendersource.com/forum/...ight=stainless
Thanks lynchee!! I had searched but think I was using too many terms. Thanks again!!
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  #9  
Old June 14th, 2014, 01:15 PM
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another point to make: rover aluminum is much weaker than Ace Hardware grade stainless.

The bolt will tear out of the aluminum before the bolt fails.
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  #10  
Old June 14th, 2014, 01:26 PM
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The mass of the seats themselves at a few tens of pounds is relatively minor. In an impact I doubt that they would move much at all compared to a body, which tends to be 150-250 plus pounds. Way more mass. The seatbelt anchors are what you should be concerned with. Usually they are mounted with the bolts in shear loading, which is quite high even for relatively small fasteners. So your stainless fasteners are plenty strong to hold the seats, but stick with the factory fasteners for the belts.
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  #11  
Old June 14th, 2014, 04:58 PM
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Kevin C. Doyle
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This is my favorite answer!

Quote:
Originally Posted by o2batsea View Post
The mass of the seats themselves at a few tens of pounds is relatively minor. In an impact I doubt that they would move much at all compared to a body, which tends to be 150-250 plus pounds. Way more mass. The seatbelt anchors are what you should be concerned with. Usually they are mounted with the bolts in shear loading, which is quite high even for relatively small fasteners. So your stainless fasteners are plenty strong to hold the seats, but stick with the factory fasteners for the belts.
Thanks so much!

KCD
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