Qualfast: 1/2 UNC X 80 (3.1/4) Studbolt & 2 Nuts A193 St/St (GR-B8/8) Screwed Studding UNC Stainless Steel Gr.B8 / Gr.8 Stud Bolt With 2 Hex Nuts BS 4882 MPN: 1/2 UNC X 80 (3.1/4) Studbolt & 2 Nuts A193 St/St (GR-B8/8) Attributes: Grade: B8/8 Leading Standard: ASME B16.5 Length: 80mm Material: Stainless Product Type: Stud Bolt c/w 2 Nuts Surface Treatment: Plain Thread Direction: Right Hand Thread Size: 1/2"unc