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Continue to ChatAVENTICS - 8103190644 - Nut for piston rod, Series MR9 (HEXAGON NUT DIN439-BM6-A2-70) https://www.valves-direct.com/product/aventics-8103190644-nut-for-piston-rod-series-mr9-hexagon-nut-din439-bm6-a2-70/