What grade are these bolts - Barnes Group?

[WhoWhatNow]

I picked up some bolt bins with hardware in them and I need some help identifying the grade of bolts. The hardware is all SAE or USS. There are one of two different designs on bolt heads. A quick google search points to the Barnes Group as the manufacture of the triangle design bolts. It looks like the grade markings are 4 dashes evenly spaced around the head and a single dot next to one of the dashes. I cant find this marking in the SAE/ASTM charts. What do I have here?

 

[sselander]

4 lines is Grade 6, not that common
don't know about the dot.

 

[WhoWhatNow]

Thanks, grade 6 it is. I wonder if the dot is material or coating related. There is some corrosion on the bolts that wipes away easily. It is a dull gray powder. The blots are shinny but I am not sure what the material/coating is.