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The first number is the diameter. The bigger the number the bigger the screw. The second number is the number of threads per inch.

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Comments (1)

  1. The first number is the diameter, but what size? The above explanation does not state a relationship which allows one to convert that number to real inches or some other unit of measure. Does anyone know what that relationship is?

    June 10, 2012 at 1:58 pm