How to say "latch" in Japanese

• ラッチCommon
  noun, suru verbThe loanword for the latch itself — the catch that holds a door or gate shut. Use this when you mean the hardware device rather than fastening in general.
• 留め金とめがねCommon
  nounAt heart a metal clasp or fastener; 'latch' is one of its senses, for the catch that holds a door, gate, or lid shut. For the mechanism itself, ラッチ is the more direct word.
  彼女かのじょはネックレスの留め金とめがねを留とめた。↗

  She fastened the clasp of her necklace.

Use 「ラッチ」 for the latch as a mechanical device, especially on doors and gates; use 「留め金」 when you picture the catch as a metal fastener or clasp holding a door, gate, or lid shut.

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

• ラッチlatch
• 留め金とめがねclasp
• 留め具とめぐlatch
• 掛け金かけがねlatch
• かんぬきbar
• ＩＳＯＦＩＸアイソフィックスISOFIX (international standard for child safety seats)
• かすがいlatch