Pivot Brackets... HELP!!!

[mhughes165]

Wow, so much misinformation in this thread

Bolt color has absolutely nothing to do with grade or strength. Just because the majority of Gr 8 bolts sold are gold zinc coated, and Gr 5 ones plain colored, does not mean they ALL are (and NO, the metal is NOT the same color inside, try grinding on a bolt head with a grinder, it's all the same color steel in there, even the 'black' ones).

Grade 8 is the HIGHEST standard SAE grade, period. While some manufacturers do make bolts with ratings that exceed Grade 8 standards, there are no standards above that set forth for them, so calling them "Grade 9" or "Grade 10", etc. is technically not correct.

Grades like 8.8, 10.9 and 12.9 ARE standard grades for METRIC fasteners. These obviously would not apply to SAE fasteners (and vice-versa).
ISO 10.9 is roughly an equivalent to SAE Gr 8


As for the brackets, I'd use ½" - 20 x 1.5" Gr 8 bolts on the pivots. For things like radius arm brackets, 7/16" is fine.

Home Depot recently began selling Gr 8 stuff again (at least the one near me did), so you should be able to get them there, yes (make sure you get Gr 8 nuts & hardened washers also).

the ones the i use actually are black inside aswell, ill have to take a picutre of one of them ground into, i get them from a small mom and pop hardware store out here, and it may not always be a color, but u must agree that 95% of the time they are colored to that method.

 

[mjonesjr]

Lol. You don't give up do you? They don't die the steel when they are mixing it, there is no die that can withstand the molting temp of steel to do such.

 

[pillen140]

its not a surface coating, thats the color of the metal all the way through, theres a reason hardware is color coded u are aware right, same reason there are marks on the head to tell u what kind of bolt it is.

grade 10 bolts are tempered bolts, they are sold for commercial applicatioons mostly, however i know for certainty that advance auto does carry them

grade 5 and lower new hardware is always silver in color, grade 8 is always gold, grade 10 is always black

arent they know as api grade or something like that? aircraft something or other?

 

[mhughes165]

arent they know as api grade or something like that? aircraft something or other?

ya, there aircraft grade hardware, i was always told they were grade 10's, that may not be there actuall name, but i know on all our bigger lifts at the old shop we always used them to prevent installation failures