The simplest formula used to calculate the tap drill size (TDS) is:

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General Studies · Machining Operations

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Tap drill size = Major diameter - Pitch

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Answer 1

Tap drill size = Major diameter ÷ Pitch

Answer 2

Tap drill size = Major diameter + Pitch

Answer 3

Tap drill size = Major diameter × Pitch

Answer 4

Tap drill size = Major diameter - Pitch

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