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That's a different measurement. In the 4 digit number the first 2 digits specify the diameter of the shaft in 64ths inch. And the second number specifies the wall thickness of the shaft in 1000ths...
Answer
That's a different measurement. In the 4 digit number the first 2 digits specify the diameter of the shaft in 64ths inch. And the second number specifies the wall thickness of the shaft in 1000ths...