ACDelco M8 Thread Hex Multi-Purpose Bolt - 11504986 Part #: 11504986 Line: ACD ACDelco M8 Thread Hex Multi-Purpose Bolt 1 Year Limited Warranty Material: Steel Thread Size: M8 Head Type: Hex Head Size (in): 1/2 Inch Head Size (mm): 13mm Thread Diameter (in): 5/16 Inch Thread Diameter (mm): 8mm Bolt Grade: Grade 9.8 Color/Finish: Black, Zinc-Plated Washer Attached: Yes Show More Show Less