Standard U-Bolt Standard U-Bolt 304 Stainless Steel Finish Plain Thread Size 1/2 In.-13 Thread Length 1 5/8 in Inside Length 4 1/2 in Inside Width 3 in Pipe Size (In.) 2 1/2 in Characteristics Has Coarse Rolled Threads for Steel or Wrought Iron Pipe Sizes Includes 2 Nuts