B7 Threaded Bar

ASTM A193 Grade B7 bolts and threaded studs are manufactured from a chromium-molybdenum steel and are quenched and tempered (heat treated) to develop the desired mechanical properties (strength). Grade B7 is the most common grade of A193 bolts used in construction. B7 threaded studs and short, headed bolts are readily available in the marketplace. Grade B7 bolts are commonly used in pipe flange connections. These bolts are typically bought and sold in a plain, bare metal finish but are often hot-dip galvanized, zinc plated, Xylan coated, PTFE coated, or otherwise coated for corrosion resistance. Note that coated bolts may not be able to withstand the high temperatures that uncoated B7 bolts can be subjected to. GradeSizeTensile ksi, minYield, ksi, minElong, %, minRA % minHBWHRC B7 Up to 2-1/2 125 105 16 50 321 max 35 max 2-5/8 - 4 115 95 16 50 4-1/8 - 7 100 75 18 50