BOLT ?

[Master Hack]

Thats just manufacturers identification marks.
One on the right is chinese

http://www.aptp.com/wp-content/themes/va/pdf/APTP_BoltNut-Chart.pdf

Smith Brothers Services - Bolt Head Markings

 

[pearl111]

Thats just manufacturers identification marks.
One on the right is chinese

http://www.aptp.com/wp-content/themes/va/pdf/APTP_BoltNut-Chart.pdf

Smith Brothers Services - Bolt Head Markings

Thanks, I thought that's what it was for, but I wasn't sure.

 

[Bansil]

Other words would a stainless-steel bolt be as hard as a #5 bolt?
I'm guessing 304-stainless steel.

...... Cancel this question, I just learned that the stainless steel is a little more than a #2 grade ......

I think 17-4PH would argue with you