Quick Fastener question

[JE4570]

I was given an opportunity through a connection I have with a friend that works at an industrial supply company that I also worked at for a short while. It specializes in fasteners and I was going to seize the opportunity to order new engine mount bolts for an employee discount price.

I will be measuring them all there so I can get the proper length and diameters, but I just wasn’t sure what grade of metric bolts I need to use. The bolts I have, have a 7 on them... not sure what grade that is indicating. Could I use 10.9? Or 12.9? Or are these a special grade that ought to be specially ordered?

 

[Jim]

.....have a 7 on them... not sure what grade that is indicating.

Not sure what the 7 is indicating... I do know it's not the grade (or classification if you will). Metric uses a 2 number designation system... #.#
The first number is the tensile strength in MPa's. The number after the dot is yield strength, also in MPa's. For what you want, anything 8.8 or higher should do just fine.

 

[MaxPete]

Agreed - go higher rather than lower, but the 12.9's are likely over-kill (if they are even available).

BTW - those lower engine mount bolts are not easy to find nor are they inexpensive - so if you can snag a few extras...I'll betcha some of the folks on this forum would like to buy some at a discount....

 

[Jim]

..I'll betcha some of the folks on this forum would like to buy some at a discount....

If you got 'em in A-2 stainless... I'd be interested in a set or two....

 

[MaxPete]

If you got 'em in A-2 stainless... I'd be interested in a set or two....

Yup, I’d take three....

 

[JE4570]

Not as golden an opportunity as I thought...

I couldn’t find any of the long ones unfortunately. My supplier didn’t have anything longer than 100mm which was really one of the only ones I truly needed (one of my front mount bolts was bent) They were really limited on metric fasteners in general. The only bolts short enough to be ordered were the top mount bolts and mine were fine. I just ordered a piece of threaded rod instead and will just cut it to length for my bent long bolt and use two locknuts. I plan on mostly just keeping what I have and cleaning them up and using marine grade anti-seize. When I get the opportunity again I’ll try to at least get a handful of the top mount bolts.

 

[5twins]

I've managed to acquire a stash of spare engine mounting bolts, among other things, by picking up a few of these misc. parts lots off eBay. This seller is usually very good about accepting best offers so you can almost always save a few dollars over his asking price .....

https://www.ebay.com/itm/1982-Yamah...899&pg=2060778&_trksid=p2060778.c100290.m3507

 

[kshansen]

Just check out the ebay guy 5twins posted about. Guess one needs to be careful checking what he's offering because the picture and descriptions don't seem to match!
https://www.ebay.com/itm/Yamaha-650...051&pg=2047675&_trksid=p2047675.c100005.m1851

I'm not the worlds best source of knowledge on XS650's but I don't think those are oil pump parts!

 

[xjwmx]

^They're starter gear train, obviously. I noticed he has over 59,000 parts listed, I assume ALL BY HAND, though so I'll cut him some slack. It's wise to look at the pic carefully with any auction to make sure they agree with the description.