How Strong is that bolt?

[Wildcat_drvr]

I had to go shopping for some hardware for Felix today.
Took a bolt with me so I wouldn't get the wrong one.
Went to Lowes,only half mile from the Li'l Lady's house to the store.
Asked the salesman what strength the bolt I had was.
He had no idea.Wasn't a kid,at least 50 years old.
Asked him what the numbers on the bolt meant.
Didn't know.I bought the highest number they had.
It was 12.9 ,.
I was hoping higher the number,stronger the bolt.
It was,I'm happy! 10.9 equals Grade 8.
Asked my Friend Google to explain Metric numbers/symbols.
This bolts: metric standards is what I learned.
Hope someone else is helped by this.
Our "Metric" Friends are gonna laugh about this.
Oh Well,,,
;cool;
Rich

 

[FZ09Bandit]

Always go grade 8 on anything substantial. The rest for little plastic pieces. Thanks for the write up.

 

[mountaincycle]

Thanks for the information :thumbup: however, I kinda shocked you expected anyone from a big box store to know anything about bolt strength.

 

[aclayonb]

It's hard to find good hardware stores these days. Gotta look for the local hardware place with the extra-grouchy old men working there. No aprons, no uniforms, no BS - just a 70 year old dude that's worked with his hands all his life and has been stocking that store for 20 years.

 

[FinalImpact]

I had to go shopping for some hardware for Felix today.
Took a bolt with me so I wouldn't get the wrong one.
Went to Lowes,only half mile from the Li'l Lady's house to the store.
Asked the salesman what strength the bolt I had was.
He had no idea.Wasn't a kid,at least 50 years old.
Asked him what the numbers on the bolt meant.
Didn't know.I bought the highest number they had.
It was 12.9 ,.
I was hoping higher the number,stronger the bolt.
It was,I'm happy! 10.9 equals Grade 8.
Asked my Friend Google to explain Metric numbers/symbols.
This
bolts: metric standards
is what I learned.
Hope someone else is helped by this.
Our "Metric" Friends are gonna laugh about this.
Oh Well,,,
;cool;
Rich

Rich, thanks for sharing ^^ :thumbup:
Just in case it went unnoticed, there is a hyper link to a chart in Rich's post --> bolts: metric standards

Adding too this: Please take note of Lubricated vs Dry Clean Threads!! It matters...
CLASS 8.8 6mm bolt, torque should be reduced by 13% If unplated = 32% reduction!
CLASS 8.8 10mm bolt, torque should be reduced by 13% If unplated = 33% reduction!
CLASS 8.8 12mm bolt, torque should be reduced by 13% If unplated = 33% reduction!
CLASS 8.8 14mm bolt, torque should be reduced by 13% If unplated = 33% reduction!

Also - washers spread load. When using larger washers understand that applied torque will be less than a fasteners shoulder contacting the mating surface directly.
FSM says all but handful of engine parts are CLEAN DRY THREADS! No grease, no oil, no locktite, no Anti-Sieze, etc.
Follow this link if that peaked your interest!
https://www.fastenal.com/content/feds/pdf/Torque-Tension Chart for Metric Fasteners.pdf

 

[Andz]

Our "Metric" Friends are gonna laugh about this.

Since I was ten years old :spank:

 

[beatle]

It's hard to find good hardware stores these days. Gotta look for the local hardware place with the extra-grouchy old men working there. No aprons, no uniforms, no BS - just a 70 year old dude that's worked with his hands all his life and has been stocking that store for 20 years.

That's what I've always done. Too bad the one near me closed last year.

They also carried Kroil, the world's best penetrating lubricant. A shame the big box stores have run them out.