Self-Aligning Rod Coupler Fk-M4 Compensates for Angular and Radial Misalignment, for Fitting On Piston Rod Side. Size=M4, Corrosion Resistance Classification Crc=2 - Moderate Corrosion Stress, Ambient Temperature=-40 - 150 °C, Product Weight=15 G, Materials Note=(* Free of Copper and Ptfe, * Conforms to Rohs), Festo