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Is it "through hole" or "through-hole"?

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It depends on the context:

1. "Through hole" (Two Words) → Used as a Noun Phrase

When "through hole" is used as a standalone noun phrase, it remains two words.
✅ "Insert the pin into the through hole."
✅ "The component has a through hole for alignment."

2. "Through-hole" (Hyphenated) → Used as an Adjective

When it modifies a noun, it should be hyphenated to form a compound adjective.
✅ "A through-hole component" (A component designed to be mounted using a through hole)
✅ "Through-hole plating" (Plating inside a hole that extends through a material)

Common Example:

• In electronics, "through-hole technology" refers to components with leads that pass through PCB holes, as opposed to surface-mount technology (SMT).

Quick Rule:

• Noun → "through hole"
• Adjective → "through-hole"

Would you like a check on a specific phrase or sentence?