"Lew Hodgett" wrote
Do yourself a favor and buy a box (100) of 1/2"-13 x 4" lg hex head bolts,

a box of (100) of 1/2"-13 hex nuts and 5 pound box of fender washers.

Lay out the bolt holes using trig function calculations.

Assemble and get a beer.

Enjoy the results of your efforts and move on to next job.

BTW, buying full boxes of fasteners is the ONLY way to get
a decent price.

There are a lot of advantages to that approach. The include;

1) You often have to go to a fastener supply house. They have folks there
who know fasteners and are a terrific resource when do various projects.

2) As Lew mentioned, buying by the box does drive the price down.
Sometimes quite dramatically. I have purchased les than 20 of a fastener in
a retail store that cost more than the box of a hundred from the industrial
supply house.

3) A fastener place has an incredible selection. You can get something
that does the job right. Instead of making do with whatever is available
down the street.

4) You end up with a supply of fasteners, parts and scrap wood laying
around. You end up with resources that allow you to build and repair things
with no or minimal cash or trips to buy things. Sometimes you can thro a
project together quick and fast that would cost big bucks or huge amounts of
time other wise.

5) You become the envy of your tool klutz friends. Maybe even impress the
mother in law!