Whitworth thread
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A triangular thread shape devised by the British Whitworth as a standard thread due to the need for thread interchangeability. It was the first thread standard ever created and was adopted in the UK. The thread angle is 55° and the size series is given in inch dimensions. It was subsequently widely adopted in European countries, Japan and other countries, but after 1958 each country switched to the international standard ISO thread, and it was abolished in Japan after 1968. Source : Heibonsha Encyclopedia About MyPedia Information |
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英国のホイットワースが，ねじの互換性の必要から標準ねじとして案出した三角ねじ山形。史上初めてつくられたねじの規格で，英国で採用された。ねじ山の角度は55°，大きさの系列はインチ寸法で与えられる。その後ヨーロッパ諸国，日本などで広く採用されたが，1958年以降は各国とも国際規格のISO(アイエスオー)ねじに移行し，日本では1968年以後廃止。
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