Products Search by Part Number Products>Actuators>Linear Actuators>Compact>CVQ>Knuckle Joints CVQ, Accessory, Knuckle Joints SMC series CVQ add on rod end knuckle joints. Accessory: Knuckle Joints Types: Singe and Double Applicable Bore Sizes: 32mm, 40mm Configuration Options Select Product Options Select values from the drop down lists or make appropriate selections to configure the part number. Type -- Pick an Option -- I (Single Knuckle Joint) Y (Double Knuckle Joint) Applicable Bore -- Pick an Option -- G04 (32mm, 40mm) Options in: Gray are not compatible with other selected option value. Red conflict with another selected option value. Amber are not recommended.