Replacement bolts?

mazda
mazda6

#1

2007 Mazda 6 V6 3.0l

Hi there,

I rounded off a bolt when trying to replace the AT Mount on this vehicle. I bought some vise grips, and bolt out kits for my second attempt.

I was wondering if I could use any replacement bolt from Oreilly’s or hardware store or do they have to be specific to the vehicle (OEM)?

I don’t know if there is a standard, but I am concerned about torque values here. I am afraid to apply the same torque values on the new bolts and later find out they were too tight or whatever.

Please help. Thanks


#2

I’ve replaced many auto bolts/nuts with ones from ACE hardware.

Take the old bolt with you so that they can match the grade,length, and thread size.

Tester


#3

Thanks Tester, will do!


#4

You can, but if you do I’d recommend getting a “grade 8” bolt (or the metric equivalent). Here’s a chart that’ll make the reason obvious. You’re better to have a too-strong bolt than a too-weak bolt. Yes, they’re available at any big-box hardware store dirt-cheap.

https://www.boltdepot.com/fastener-information/Materials-and-Grades/Bolt-Grade-Chart.aspx


#5

Thanks a lot for the tip and the link!


#6

On this subject, isn’t the metric equivalent of grade 8 marked 10.7?


#7

Doesn’t your new mount come with studs or bolts?


#8

Read here:

http://elginfasteners.com/resources/metric-bolt-conversion-metric-to-standard-bolt-conversion/

In metric we have:
4,6 supersoft, pretty much like butter on a hot windowsill
5,8 standard
8,8 strong, but can be stretched.
10,9 superstrong
12,9 break me if you can :stuck_out_tongue_winking_eye:

Only steel bolts are rated this way. Stainless is rated differently and has a much lower max. torque limit.


#9

That’s why I said “or metric equivalent” and posted a chart that shows the metric ratings.


#10

Nope… I ordered all 3 mounts from the Mazda dealer and none of them came with bolts.


#11

I was just over to Home Depot today looking for a fastener. They have a pretty good assortment of grade 8 bolts as well as the metric version of grade 8. Suggest to OP to look at bolt head. There are often marks or numbers on them that provide a clue what grade it is. If you know the torque spec, you can usually figure out the required bolt grade too.


#12

I found my local Lowes to carry a better assortment of fasteners suitable for cars.
Another non-chain hardware store in 15 miles literally has it all, but getting to Lowes 2 miles down the road gets 90% of what I usually need.


#13

I find the parts store rarely carry anything but grade 5, same with Tractor Supply. HD and Lowe’s do but I usually go to Fastenal or Industrial Bolt Supply. If they don’t have what you want, you didn’t need it.


#14

The problem I find with Fastenal is, you can’t buy just one piece of hardware.

Instead, you must purchase a package of that hardware which may be a half dozen.

When you only need one.

Tester


#15

I wonder if anyone who sells fasteners by the piece can do so profitably. TSC sells grade 5 and grade 8 by the pound but because it’s loose in bins a lot of it leaves the store in peoples pockets.

And years ago I realized how much time was being wasted over broken and missing bolts so I bought a hardware store bolt bin and stocked it with a dozen of every common size SAE and Metric bolt,nut, screw and washer and lengths of threaded rod also. And I never charged for them. The time saved not chasing replacements down or cleaning the old ones to reuse them was more costly than the new bolts.


#16

Yeah there is that. I needed two bolts, nuts and washers to install a new exhaust on my truck. Ended up with 3 bolts, 5 nuts and 10 washers.

Edit: but they had them when no one else in town did.


#17

Buy single pieces here:

https://www.boltdepot.com/Default.aspx


#18

That does no good if you need the piece of hardware NOW!

Tester


#19

Thank you, Captain Obvious…

;-]


#20

I think you should change your handle.

Because you’re not.

Tester