What is the formula to obtain the undercut finish diameter for a Unified thread given the major diameter D and thread depth d?

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Multiple Choice

What is the formula to obtain the undercut finish diameter for a Unified thread given the major diameter D and thread depth d?

Explanation:
The undercut finish diameter is the minor diameter, the smallest diameter of the thread. From the major diameter, material is removed on both the crest and the root by the thread depth d, so the total reduction in diameter is 2d. Therefore the finish diameter is D minus 2d. This matches the standard relation for Unified threads: minor diameter = major diameter − 2 × depth.

The undercut finish diameter is the minor diameter, the smallest diameter of the thread. From the major diameter, material is removed on both the crest and the root by the thread depth d, so the total reduction in diameter is 2d. Therefore the finish diameter is D minus 2d. This matches the standard relation for Unified threads: minor diameter = major diameter − 2 × depth.

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