Titanium bolts for skids? - Toyota FJ Cruiser Forum
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post #1 of 27 (permalink) Old 02-24-2017, 01:45 PM Thread Starter
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Titanium bolts for skids?

Took advantage of the warm weather to drop my RCI skids, most of the bolts were so damaged I had to use a Irwin Bolt-grip to get them out.
I have to replace 6 of the bolts and at first I was thinking of getting Fourtreks Rock slider washers but for less money I could replace them with Titanium bolts Pro-Bolt Titanium Hex Head M8 x (1.25mm) x 50mm or even the Titanium Dome head?
Anyone ever do this, did it work?
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post #2 of 27 (permalink) Old 02-24-2017, 01:55 PM
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Re: Titanium bolts for skids?

I went with Class 10.9 yellow zinc plated when I replaced my skid bolts, instead of the normal Class 8.8

I don't know, but how does the strength of titanium compare to class 10.9?

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post #3 of 27 (permalink) Old 02-24-2017, 02:12 PM
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Re: Titanium bolts for skids?

Interesting. Never thought about it.

I've replaced all mine with zinc plated grade 10.9 as well.

Let's look at some charts for strength.

Grade 8.8 UTS = 116 kpsi
Grade 10.9 UTS = 150 kpsi
Titanium Fastener = 149 kpsi

kpsi = 1000 lbs/sq in
UTS= Ultimate tensile strength

There you have it, not any stronger than the much cheaper grade 10.9 bolts. But titanium is lighter and likely more corrosion resistant.
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post #4 of 27 (permalink) Old 02-24-2017, 02:21 PM Thread Starter
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Re: Titanium bolts for skids?

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Iconic_ previously said: View Post
Interesting. Never thought about it.

I've replaced all mine with zinc plated grade 10.9 as well.

Let's look at some charts for strength.

Grade 8.8 UTS = 116 kpsi
Grade 10.9 UTS = 150 kpsi
Titanium Fastener = 149 kpsi

kpsi = 1000 lbs/sq in
UTS= Ultimate tensile strength

There you have it, not any stronger than the much cheaper grade 10.9 bolts. But titanium is lighter and likely more corrosion resistant.
Where did you get you 10.9 bolts from Iconic?


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post #5 of 27 (permalink) Old 02-24-2017, 02:32 PM
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Re: Titanium bolts for skids?

Also have to think about galvanic corrosion. Titanium is on the cathodic side, and aluminum and steel are on the anodic side (outer edges of the galvanic corrosion chart). What this means is any steel or aluminum in contact with the titanium bolt has a high potential to corrode.

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post #6 of 27 (permalink) Old 02-24-2017, 02:43 PM
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Re: Titanium bolts for skids?

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Papa Dragon previously said: View Post
Where did you get you 10.9 bolts from Iconic?
Fastenal. I live a few blocks away and since the company I work at has an account there, Fastenal allows me to get the same discount. It's like half off! Working the system.

I have a lot of them and try to replace them before they get too badly corroded. It also helps none of them are exposed to rocks on the underneath side because of my skids.
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post #7 of 27 (permalink) Old 02-24-2017, 02:55 PM Thread Starter
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Re: Titanium bolts for skids?

I think the zinc plated grade 10.9 are going to be my best plan. So no one's used the Fourtreks Rock slider washers?


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post #8 of 27 (permalink) Old 02-24-2017, 04:32 PM
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Re: Titanium bolts for skids?

Titanium would not be a good choice. Grade 8 would be, with antiseize.

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post #9 of 27 (permalink) Old 02-24-2017, 04:41 PM Thread Starter
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Re: Titanium bolts for skids?

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Titanium would not be a good choice. Grade 8 would be, with antiseize.
I was using grade 8 and they were so badly damaged that I had to use an Irwin Bolt-grip to remove them. Definitely not going with Titanium now, the 10.9 looks like my best bet.


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post #10 of 27 (permalink) Old 02-24-2017, 04:51 PM
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Re: Titanium bolts for skids?

Don't the RCI have a plate welded around the bolt heads to protect them? Here are my brother's homemade skids. The 3/16" additional plate protects the bolts pretty well.
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