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H1

Classes of Unified Threads 2B & 2A

【英】困ったときの知恵袋詳細
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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