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What Is A 6×5 5 Bolt Pattern? The 6×5. 5 Bolt Pattern or Pitch Circle Diameter (PCD) is made up of the stud count (6) and the bolt circle measurement (5.5), the notional circle determined by the center position of the studs. Is 6×5 5 the same as 6×139? A: Yes, 6×5. 5 is a