B7 Studs | A193 | Black Oxide Finish_1Product Features: The material for B7 Studs and Nuts conform to the requirements of ASTM A193 Grade B7 AISI 4140 4142 4105High strength carbon steel maximum yield strength of 105000 PSI and minimum tensile strength of 125000 PSI For 1€� and smaller: threads are Unified inch coarse or fine series (UNC or UNF series) Class 2A in accordance with ANSI/ASME B1.1 For size larger than 1€�: threads are Unified coarse or 8 thread series (UNC or 8 UN Series) Screw threads are based on System 21 of ANSI/ASME B1.3 Coat