One more reminder to tighten your suspension bolts - Page 4 - LotusTalk - The Lotus Cars Community
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post #61 of 74 (permalink) Old 10-24-2017, 03:18 PM
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So what's the final verdict? I have a 2006 Exige. I'm going to have these bolts checked out by my shop when I swap coilovers, but is it worth it to just replace with 12.9 bolts while they're in there?

Yes, and you should replace them every time you remove them IMO since they cost like $12 total

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post #62 of 74 (permalink) Old 10-25-2017, 01:46 PM
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Yes, and you should replace them every time you remove them IMO since they cost like $12 total
Is there a handy amazon (or similar) link for replacement bolts?

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post #63 of 74 (permalink) Old 10-26-2017, 05:30 AM
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https://www.fastenal.com/products/details/1139623?term=m10+50&r=~%7Ccategoryl1:%22600000%20F asteners%22%7C~%20~%7Ccategoryl2:%22600039%20Socke ts%22%7C~%20~%7Ccategoryl3:%22600040%20Socket%20Ca p%20Screws%22%7C~%20~%7Csattr06:%5E%22Class%2012.9 %22$%7C~

25 at 50 cents each. Your local dealer can order them and you can save on shiping.

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post #64 of 74 (permalink) Old 02-18-2018, 02:47 PM
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I wanted to add this to my previous post (post#51) but I guess it is too old for LotusTalk to allow me to edit it. This is the video of the bolts breaking on my car. (@09:25)
https://youtu.be/ZCIUPasq2EQ?t=9m25s


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post #65 of 74 (permalink) Old 02-18-2018, 04:13 PM
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I wanted to add this to my previous post (post#51) but I guess it is too old for LotusTalk to allow me to edit it. This is the video of the bolts breaking on my car. (@09:25)
https://youtu.be/ZCIUPasq2EQ?t=9m25s
Here's where mine broke. In the full video you can also hear one bolt break at T20 as well I believe.


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post #66 of 74 (permalink) Old 05-26-2019, 06:57 AM
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Iíve spoken to someone that works on tracked Eliges and theyíre hesitant to do 12.9 because they can be more brittle.

Anyone have a source for 10.9 bolts that will work?
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post #67 of 74 (permalink) Old 05-26-2019, 07:14 AM
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Anyone have a source for 10.9 bolts that will work?
...

Cleaned up Fastenal URL
posted by @kfennell

because racecar
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post #68 of 74 (permalink) Old 05-26-2019, 07:18 AM
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Oops that was 12.9 ...

Here's the 10.9 equivalent.


Not bad, cheap insurance @ $1 apiece.

Last time I went to my local Fastenal B&M dealer, I spent a few hours, and left w a $10 bag of M6 SS cap screws.

because racecar

Last edited by Turbopun; 05-26-2019 at 07:24 AM.
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post #69 of 74 (permalink) Old 07-07-2019, 09:02 AM
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I’ve spoken to someone that works on tracked Eliges and they’re hesitant to do 12.9 because they can be more brittle.

Anyone have a source for 10.9 bolts that will work?
https://www.engineersedge.com/hardwa...109__14821.htm
https://www.engineersedge.com/hardwa...129__14822.htm

https://itstillruns.com/129-bolt-she...-11415080.html


From what I read it seems shear strength is derived from its measured tensile strength. But if you have proof that 10.9 has a greater ability to resist shearing than a 12.9 grade bolt please post it up to educate us. I am not arguing - I, just like everyone else wants what is best for our cars! Thx


Click links to see my 2008 Lotus Exige-S 240 , '99 M3, 505rwhp '89 Mustang ( sold) , '05 WRX STI ( sold) homepages or here for my spin compilations (ispunuwin & ispinuwin2!)!
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post #70 of 74 (permalink) Old 07-07-2019, 10:40 AM
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One more reminder to tighten your suspension bolts

Quote:
Originally Posted by EricH View Post
https://www.engineersedge.com/hardwa...109__14821.htm
https://www.engineersedge.com/hardwa...129__14822.htm

https://itstillruns.com/129-bolt-she...-11415080.html


From what I read it seems shear strength is derived from its measured tensile strength. But if you have proof that 10.9 has a greater ability to resist shearing than a 12.9 grade bolt please post it up to educate us. I am not arguing - I, just like everyone else wants what is best for our cars! Thx


I really donít know. Thatís why I asked!

For my own edification, which part number in the attached is the bolt in question?

Any other vulnerable bolts or thatís it?
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post #71 of 74 (permalink) Old 07-07-2019, 03:52 PM
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It’s not a bolt, it’s #32 and nut #29. 32 is a ball joint at one end of the rear toe rod.

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post #72 of 74 (permalink) Old 07-07-2019, 04:49 PM
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While those are very important to always check the torque of, this discussion is actually about the hardness values and replacement of bolts #5 in the picture.


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post #73 of 74 (permalink) Old 07-07-2019, 06:02 PM
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Quote:
Originally Posted by mkiv808 View Post
Iíve spoken to someone that works on tracked Eliges and theyíre hesitant to do 12.9 because they can be more brittle.

Anyone have a source for 10.9 bolts that will work?
Here's a fairly simple explanation of higher grade bolts with respect to being brittle.

Are Grade 8 bolts more brittle than Grade 5? (8.8 vs 10.9 Metric) | Helping you work smarter not harder

San

#8 Metric Allen Key, Plastic Carpet Buttons
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post #74 of 74 (permalink) Old 07-08-2019, 04:51 AM
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I've read through this thread several times through the years and one thing I don't really see talked about is the quality of the original bolts that have been subject to failures. Lotus is not known for having the highest quality standards, and like most companies, I'm sure they rely on the lowest bidder when sourcing parts for manufacture. My background in aviation has kept me aware of hydrogen embrittlement in hardware during its service life, leading to sudden unexpected failure. To those that have been asking; yes 10.9 and 12.9 bolts have higher strength than 8.8 bolts but they are more susceptible to embrittlement than lower grade bolts. When reading about how and when some of these failures occurred I just wonder if the bolts are failing due to embrittlement caused by "less than optimal manufacturing" and environmental exposure. Here is a link to a good two-page read on bolt failure due to embrittlement.
http://www.boltscience.com/pages/the...-fasteners.pdf

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