Material Specifications for Drillco Maxi-Bolts High Strength Steel Maxi-Bolts ASTM A193 Grade B7 Mild Steel Maxi-Bolts ASTM A36 Stainless Steel Maxi-Bolts ASTM A193 Grade B8 - Class 1 - Type 304 Stainless Steel Maxi-Bolts ASTM A193 Grade B8 - Class 2 - Type 304 Stainless Steel Maxi-Bolts ASTM A193 Grade B8M - Class 1 - Type 316 Stainless Steel Maxi-Bolts ASTM A193 Grade B8M - Class 2 - Type 316