Classes of Unified Threads 2A and 2B

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Cutting TapsRoll (Forming) Taps Unified Threads Standard (Screw Threads, Center Holes)

I was wondering, what do the letters 2A or 2B mean when I see them on a drawing that shows thread sizes 3/8-16UNC 2A and 3/8-16UNC 2B.

Those letters represent the class of fit for inch size internal and external Unified Screw Threads. The class of a Unified Thread is an alphanumerical designation to indicate the standard grade of tolerance and thread allowance of a specific thread.

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