castellated nut

Noun

A type of nut (internally threaded fastener) with castellations, typically to hold a retaining pin that is passed through a cross-drilled hole, such as a cotter pin.

Japanese Meaning

キャステレーテッドナット：内部にねじ山がある締結部品で、キャッスティレーション（城壁のような切れ込み）が施され、十字穴に通すピン（例：cotter pin）を保持するための構造を有するナット。

What is this buttons?

Before reassembling the axle, the mechanic secured the castellated nut with a cotter pin to prevent loosening during operation.

Google Translation / DeepL Translation

アクスルを再組み立てする前に、整備士はキャッスルナットを割りピンで固定して、作動中に緩まないようにしました。

Details

Sense（1）

A type of nut (internally threaded fastener) with castellations, typically to hold a retaining pin that is passed through a cross-drilled hole, such as a cotter pin.

castellated nuts

（ plural ）

Details

castellated nut

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