Available in 1/4-20, 5/16-18, 3/8-16, and 1/2-13 threads. Priced individually - buy what you need.
These threaded plates can be welded at each end, minimizing the risk of distorting the thread. The flat part on either side of the threads is 0.140″ thick, and the threaded portion is 1/4″ thick.
1/4-20: 1" x 7/16"
5/16-18: 1-1/2" x 5/8"
3/8-16: 1-1/2" x 5/8"
1/2-13: 1-1/2" x 13/16"