Quote:
Originally Posted by JohnnyBfromPeoria
What hardness are the stock bolts? I'd assume Grade 8, shown on the bolt head as 8.8. I've seen Grade 10 at my local Ace Hardware, for what it's worth, just not a lot of selection in size.
John B.
|
The marking on the head is the property class of the metric bolt. Property class defines hardness and tensile strength
8.8 = Rockwell C22-C32 (M5 thru M16)
8.8 = Rockwell C23 - C34 (M18 thru M39)
10.9 = Rockwell C32 - C39
12.9 = Rockwell C39 - C44
__________________
Whipple S/C, 3.750 pulley, JRE rough idle blower cam kit, Trunion upgrade, C5R timing chain, LS2 chain dampner, Melling 10296, Dynatech 1 7/8 LT headers, OR pipes, Dual valve RX catch can, ID 850 Injectors, LPE Dual fuel pump, CAI with Apex scoop, VMax ported T/B, ADM Tune 675 RWHP 560 TQ
Last edited by Chevy Fanatic; 05-09-2013 at 08:48 PM.
|