The solid brass nuts on our bench bolts slide into a pre-drilled hole in the stretcher, and distribute pressure to prevent breakout. A bench can be made very rigid (without complex joinery) by using a wide stretcher, since the stretcher is bolted into position.
The steel bolts are 6" long and 1/2" in diameter. The nuts are 25mm x 25mm and will fit perfectly in a 1" hole.
Made in Canada.