Depends on what your goals are. The 'ultra coating' offers greatly improved
corrosion resistance, so you can reasonably expect that no one will want to
replace them again in another 30 years.
Click on the link that says 'Catalog page', there you'll see :
>>>
Ultra-Coated Grade 8 High-Strength Hex Head
An organic polymer coating, also known as armor coat, is applied to
cadmium-plated steel fasteners to provide nearly twice the corrosion
resistance of comparable hot dipped galvanized fasteners, and does not
affect function of the thread. In addition, these screws are often effective
replacements for stainless steel cap screws. The coating has a maximum
temperature of 6500 F.
Salt spray resistance of 1000 hours per ASTM B117. Screws meet SAE J429.
Rockwell hardness is
C33-39 with a minimum tensile strength of 150,000 psi. Made of medium-carbon
alloy steel that has been
quenched and tempered.
<<<
Randall
>
> I am replacing the bolts that connect the body to the frame (or at least
> the ones visible in the floor pan), but don't know the difference
> between two options, so I turn to the list once again. On McMaster.com,
> they list these grade 8 bolts in either:
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