Can you i.d this bolt?

[mad57]

Can you i.d this bolt? what strength is it? its about 5/8 or 3/4 thanks.

 

[64coupe]

Grade 5

Keith

 

[mad57]

ok but whats the triangle for?

 

[tstang90]

i forgot exactly with these markings but i believe that the marking as for what grade it is.

 

[Charles (in GA)]

Triangle is most likely a manufacturers ID mark. As already noted, the three hashes are standard markings for a grade 5 bolt.

Charles

 

[srmofo]

its a grade 5 but youll have to dig through this to find the triangle...it shows up in the 70s
http://www.dot.state.il.us/materials/fasteneridentificationguide.pdf

 

[Joe B.]

That was made by Infasco.
http://www.infasco.com/

They are probably the largest manufacturer of standard hex head cap screws in North America. You have about the most common hex head cap screw in America in that picture.


Scary, I have been out of the fastener business for 9 years and I still knew that one as soon as I saw it.

 

[mad57]

Thank you!!! its one of the 8 bolts that hold (ALL) the weight on my byb 4 post lift, i thought about changing them to grade 8 bolts what do you guys think is over kill better or just go with byb stock grade 5 bolt?

 

[Falcon67]

Proof load for grade 5 in that size is 85,000 PSI. Ought to hold things in place for a while. Note that if you do change the bolts, be sure and apply the correct torque for the size and grade or you could actually weaken the structure.

 

[Full Size 66]

I'm pretty sure Grade 5 will give more strech before failure. Grade 8 just kinda goes like a gun. Thus I'd stay with the 5 cause it will take more abuse 5 is soft 8 is harder......

 

[nissan_crawler]

I'm pretty sure Grade 5 will give more strech before failure. Grade 8 just kinda goes like a gun. Thus I'd stay with the 5 cause it will take more abuse 5 is soft 8 is harder......

kinda/sorta/but not really.

Yes, a grade 5 will stretch more before it fails. HOWEVER, that grade 5 has long since snapped long before the grade 8 begins to think about stretching.

grade 5 failure point hasn't begun to hit grade 8 yield point.

About the only place where grade 5 would fair better is under impact loads.

Now, you can get bolts that will bend like a grade 5, yet are stronger than grade 8, but they're $$$$$$.

 

[mad57]

nissan what are those$$$$ bolts called? thks. mad