Grade 8 can be about any color, depends on who makes them. If you don't know how to read the grades, look at the top of the bolt...You will see some marks on the top (usually) If there are 3 then it is a grade 5, if there are 6 it is a grade 8, if the bolt is black it is usually hardened. Hardened bolts are tempered (heated up extemely hot and dumped in an oil like substance. Hardened bolts are ideal for for a pressure pulling straight up and down, not sideways on the bolts. In my opinion hardened bolts are the way to go for all around strength, grade 8 will do the job but will wear out faster, especially if the are rubbing on something.
John
Like to go sloppin' 'round in da mud in a rapid fashion....=)
<a target="_blank" href=http://coloradok5.com/gallery/albun31?&page=1>See my pics here</a>