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Continue to ChatAVENTICS - 8103190424 - Nut for piston rod, Series MR9 (HEXAGON NUT ISO8675-M42X2-5-A2A) https://www.valves-direct.com/product/aventics-8103190424-nut-for-piston-rod-series-mr9-hexagon-nut-iso8675-m42x2-5-a2a/