Setup Studs - Standard Style - The steel inch studs are made of stress proof steel, to ASTMA 311 class B. Yield strength is 100,000 psi, tensile strength is 125,000 psi. Stainless studs are made from Type 303. The metric studs are made of steel with rolled threads. Sizes M6-M12 are heat treated to strength class 10.9. Sizes M16-M24 are heat treated to class 8.8. Black oxide finish. Metric dimensions are in millimeters.