Stud to ASTM A193 GR. B8C ALUMINIZED STEEL 3/4" X 10 UNC X 5.276" - 50 PCS. 3/4" X 10 UNC X 5.25" - 25 PCS. Hexagon head bolt to ASTM A193 GR. B8C ALUMINIZED STEEL 3/4" X 10 UNC X 2.559" - 41 PCS.