White Oak, or Ash
Hello becka1203, You would use whats called a Heavy Duty Top Plate. There are a few different types. Some are used to install the lags at a 90 deg angle and other are designed to install the lags with a slight angle. Her is a link to one that has a video to show how they are installed. https://www.homedepot.com/p/Waddell-Heavy-Duty-Top-Plate-2755/100390125?keyword=Heavy+Duty+Top+Plate If the legs that you want to use do not have a 5/16" bolt in it you can add one to it. Here is a link to a hanger bolt. https://www.homedepot.com/p/Everbilt-5-16-in-18-tpi-x-2-in-Coarse-Standard-Steel-Plain-Hanger-Bolt-2-Pack-809351/204273743
No, this product does not come in size of 36 inches.
No. Just a solid wood leg.
mp, Waddell recommends to not exceed 25 pounds of direct pressure per leg. Thank you
You will need some type of apron or rails to create a table with these. I used mortise and tenon but you could use glue and pocket screws or dowels or biscuits. Then once you have a base you could buy table buttons or make your own out of some 1.5 by 1.5 by .75 hardwood pieces and screw into bottom of plywood and into inside of aprons.