You asked:

Is 3/8 inch smaller than 5/16 inch?

No
inch
inch

international standard inch (the unit of length)

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Other ways this question is asked:

  • is 3/8 inch smaller than 5/16 inch
  • is 3/8 inch less than 5/16 inch
  • is 5/16 inch larger than 3/8 inch