On 2009-05-22, Lew Hodgett wrote:

Much prefer hex head machine bolts with a fender washer under the head
and nut.

That's what I plan on using for the upright 2x4s (handrail) I'm attaching to
the step stingers on our deck. Zinc 3/8" thru bolts with fender washers. I
want some serious compression on that wood besides the actual fastener shear
strength. I'm a machanical type, so any advice is welcome in this new wood
world.

nb