Trailing Arm Bolts

[Doug Brown <dougalfa36@xxxxxxxxx>]

Alfa Digest,

My chassis end trailing arm bolts are marked 9.8 and
the axle end are 8.8.  SAE handbook says 9.8 are 9%
stronger than SAE grade 5 and 8.8 are equivalent to
SAE
grade 5.

So going to SAE grade 8 is too much and at least
something else to consider, you must have the arm
bushing bear on the shank of the bolt only which means
that finding a standard gr. 8 will be hard, Carroll
Smith pointedly says NO gr. 8 bolts on race cars, and
I think gr. 8 maybe more suseptable to corrosion
cracking (it is under the car afterall) but maybe a
materials engr can help us here.

Finally, metric bolts are available in all grades and
hardnesses at any good fastner/industrial hardware
store.  Stay away from Fastenall and any common
hardware store. The Fastenall people here in Columbus
are somewhat clueless about metric and commom hardware
stores will not have the diameters needed.

Doug Brown
Alfa racecar #36
And a couple others
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