Automotive grade bolts from Autozone strong enough for holding motor mounts?
#1
Honda-Tech Member
Thread Starter
Join Date: Mar 2007
Location: Maryland, United States
Posts: 1,124
Likes: 0
Received 0 Likes
on
0 Posts
Automotive grade bolts from Autozone strong enough for holding motor mounts?
Hey everyone, are the automotive grade bolts from Autozone strong enough to hold motor mounts. I'm putting an ls turbo in an ek. They say category 8 but not grade 8. Is it the same? Also, should I use locktite on them? On the head it says 8 8. Any help would be great.
Modified by scbmx87 at 5:41 PM 10/2/2008
Modified by scbmx87 at 5:41 PM 10/2/2008
#2
Junior Member
Join Date: Aug 2008
Location: Orlando, FL, USA
Posts: 99
Likes: 0
Received 0 Likes
on
0 Posts
Re: Automotive grade bolts from Autozone strong enough for holding motor mounts? (scbmx87)
Well, I don't know what the requirement is, but the "8 8" on the head is a marking for metric bolt strength. Grade 8 is a US (or more precisely, SAE) marking. And....
This place says that 8.8 bolts aren't as strong as 10.9's.... I would tend to agree. I think that the 10.9's would be much more likely to be engine mount bolts.
Take a look at this chart from the same site:
http://www.boltdepot.com/faste....aspx
Note the 830, 940 and 1040 MPa (that's MegaPascals.) for the strength of the 10.9's - Converts to 120381, 136335, and 150839 psi. Grade 8 US bolts are 120000, 130000, and 150000, so I'd say 10.9's are a better match for grade 8's than 10.9's.
Might be worth getting the upgrade....but not having done it, I'm not really in a position to say.
This place says that 8.8 bolts aren't as strong as 10.9's.... I would tend to agree. I think that the 10.9's would be much more likely to be engine mount bolts.
Take a look at this chart from the same site:
http://www.boltdepot.com/faste....aspx
Note the 830, 940 and 1040 MPa (that's MegaPascals.) for the strength of the 10.9's - Converts to 120381, 136335, and 150839 psi. Grade 8 US bolts are 120000, 130000, and 150000, so I'd say 10.9's are a better match for grade 8's than 10.9's.
Might be worth getting the upgrade....but not having done it, I'm not really in a position to say.
#3
Honda-Tech Member
Thread Starter
Join Date: Mar 2007
Location: Maryland, United States
Posts: 1,124
Likes: 0
Received 0 Likes
on
0 Posts
Re: Automotive grade bolts from Autozone strong enough for holding motor mounts? (PerryRT)
Thanks for the info bud, that was really helpful! Looks like I need me some 10.9s.
#4
Junior Member
Join Date: Aug 2008
Location: Orlando, FL, USA
Posts: 99
Likes: 0
Received 0 Likes
on
0 Posts
Re: Automotive grade bolts from Autozone strong enough for holding motor mounts? (scbmx87)
Probably not a bad idea.... In the long run, bolts are cheap insurance. Glad I could help.
#5
Re: Automotive grade bolts from Autozone strong enough for holding motor mounts? (scbmx87)
SAE Grade 8 is approximately equal to Metric Class 10.9. See sites like https://jdparts.deere.com/part...o.htm
Looking at the prices of some motor mount bolts at an OEM Honda parts site suggests they may actually be SAE Grade 5 ( = ~ Metric Class 8.8). That is, the prices are low enough that they may be the lower strength steel. But I cannot confirm. Suspension bolts are much higher priced, but I am not sure if this is because the suspension bolts are Metric Class 10.9 or because of special features like splines on them.
Still, like Perry and you are thinking, it's best not to gamble. Barring more evidence, I'd buy the 10.9 ones. Two resources for them:
--True Value hardware stores often have Metric 10.9 in open bins. Rarely do they not have the bolt I need when working on my Hondas. Home Depot OTOH has failed me many a time.
--Junkyard. Much cheaper than True Value.
Looking at the prices of some motor mount bolts at an OEM Honda parts site suggests they may actually be SAE Grade 5 ( = ~ Metric Class 8.8). That is, the prices are low enough that they may be the lower strength steel. But I cannot confirm. Suspension bolts are much higher priced, but I am not sure if this is because the suspension bolts are Metric Class 10.9 or because of special features like splines on them.
Still, like Perry and you are thinking, it's best not to gamble. Barring more evidence, I'd buy the 10.9 ones. Two resources for them:
--True Value hardware stores often have Metric 10.9 in open bins. Rarely do they not have the bolt I need when working on my Hondas. Home Depot OTOH has failed me many a time.
--Junkyard. Much cheaper than True Value.
#6
Honda-Tech Member
Thread Starter
Join Date: Mar 2007
Location: Maryland, United States
Posts: 1,124
Likes: 0
Received 0 Likes
on
0 Posts
Re: Automotive grade bolts from Autozone strong enough for holding motor mounts? (honda.lioness)
I realized that I have about 20 friends with hondas. I got all my bolts, OEM for free! You guys were a huge help, its much appreciated. ONe for each of you!
Thread
Thread Starter
Forum
Replies
Last Post
BlueRex1020
Honda Civic / Del Sol (1992 - 2000)
4
08-14-2009 04:19 AM
JDMNICA
Tech / Misc
1
06-02-2009 04:11 PM
digital sol
Hybrid / Engine Swaps
4
07-23-2008 10:30 AM