In thread terminology, which diameter is the largest for a Unified thread?

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Study for the CNC Threading and Machining Test. Use flashcards and multiple choice questions; each question comes with hints and explanations. Prepare confidently for your exam!

Multiple Choice

In thread terminology, which diameter is the largest for a Unified thread?

Explanation:
The largest diameter in a Unified thread is the major diameter. It’s measured across the crests of the threads—the outermost width of the thread profile. This dimension defines the overall external size of the thread, like the bolt’s outer diameter. The minor diameter is the smallest diameter at the thread roots, and the pitch diameter is the middle diameter where the thickness of the thread equals the thickness of the gap. Thread length isn’t a diameter at all. So the major diameter is the largest dimension of the thread.

The largest diameter in a Unified thread is the major diameter. It’s measured across the crests of the threads—the outermost width of the thread profile. This dimension defines the overall external size of the thread, like the bolt’s outer diameter. The minor diameter is the smallest diameter at the thread roots, and the pitch diameter is the middle diameter where the thickness of the thread equals the thickness of the gap. Thread length isn’t a diameter at all. So the major diameter is the largest dimension of the thread.

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