Stud Bolt Standard ASTM A193Â Grade B7 is made of a chromium-molybdenum metal alloy which is heat treated to obtain the desired strength. Grade B7 is widely used in construction, oil and gas (oil and gas), etc. Usually hot dip galvanized or PTFE coated. For stud bolts or Grade B7 bolts, use A194 2H nuts or hex nuts. Baut tanam