How to say "bolt" in Japanese

• ボルトCommon
  nounCovers the hardware sense: a metal fastener, typically threaded and paired with a nut, used to hold parts together, as in machinery or construction.
  そのボルトに嵌合かんごうするナットが必要ひつようです。↗

  We need a nut that will fit that bolt.
• 用心棒ようじんぼうCommon
  nounRefers to the bar or bolt slid across a door to lock it, not the metal fastener. It is a specific door-hardware term, so it is not the word you want for the fastener sense.

Use 「ボルト」 for the metal fastener with a threaded end; use 用心棒 only for the sliding bar that locks a door shut — two entirely different senses of 'bolt'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• ボルトbolt
• かんぬきbar
• 心張り棒しんばりぼうbar (e.g. on a door)
• 行方をくらますゆくえをくらますto disappear
• 用心棒ようじんぼうbar (on a door)
• つっぺ(door) bar