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I have found a ref to "castellation notch" and this:
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Castellated nut. 101. Bellows cover ... Ecrou. 37. Tige de clapet avec soufflet métallique d’étanchéité ... Écrou crénelé. 101. Couvercle du soufflet ...
www.samson.de/pdf_de/s80150s1.pdf - Similar pages