Phenolic Grade
Posted by admin on Tuesday, December 22, 2009 · Leave a Comment
What material bolt should I use for my application?
I am currently using stainless steel (sorry, I don't know the grade) bolts to fasten down an intake manifold to a specialty engine. The bolts are M6-1, and vary in length from 90mm to 145mm and the shafts are .912 in diameter. The problem is that they need to be tightened to 15 ft.lbs. of torque and they snap about 25% of the time.
I know that this torque seems high for an intake manifold, but it is necessary when using cork gaskets, phenolic spacers, and the charge air is compressed at over 20 psi.
It seems to me that I need stronger bolts, but I don't know what to specify or what the different grades of bolts indicate.
I did a quick check and a 0.250-inch (M6 is about 0.24-inch in diameter) 300 series CRES fastener should be torqued to 70-in*lbf (5.8-ft*lbf) )if it is unlubricated. If it's lubricated, it should only be torqued to 42-in*lbf (3.5-ft*lbf).
You can specify a higher material strength fastener by asking for a 10.9 or 12.9 fastener strength. You probably have a 8.8 strength rating which is about 660 MPa of yield strength where the 10.9 is 940 MPa and the 12.9 is 1100 MPa. The 12.9 rated fastener should almost double your allowable torque.
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