A194-7 Nuts & High Strength Bolts
The reason that A194 grade 2H nuts are used more often with A193 grade B7 bolts is simply cost. Both A194 2H and A194 grade 7 nuts have the same minimum mechanical requirements, they differ only in chemistry. The industry has chosen 2H nuts to be the primary nut for B7 bolts, as well as allows them to be substituted for A563 grade C …