10-32tpi; across the flats 0.375"; overall height 0.390".
1/4"-28tpi; across the flats 0.437"; overall height 0.468".
5/16"-24tpi; across the flats 0.562"; overall height 0.531".
3/8"-24tpi; across the flats 0.625"; overall height 0.625".
1/2"-20tpi; across the flats 0.750"; overall height 0.812".