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Continue to ChatAVENTICS - 2990600304 - Nut for piston rod, Series MR9 (HEXAGON NUT MR9-M12X1.25-AISI 316) https://www.valves-direct.com/product/aventics-2990600304-nut-for-piston-rod-series-mr9-hexagon-nut-mr9-m12x1-25-aisi-316/