A faucet fixation system, comprising: a fastener configured to couple to a faucet and extend through a support structure of the faucet; and a connector comprising: a base having a longitudinal bore receiving the fastener and a radial bore extending transversely through the longitudinal bore; and a nut assembly disposed in the radial bore and around the fastener, wherein the nut assembly includes a first locking member, which has a first threaded portion and a first actuating portion disposed on opposite sides of the fastener, and a second locking member, which has a second threaded portion and a second actuating portion disposed on opposite sides of the fastener; wherein in a locking position of the connector, the first and second threaded portions engage threads of the fastener to prohibit relative sliding movement between the connector and the fastener in a longitudinal direction while allowing the connector to rotate along the threads of the fastener; wherein in a non-locking position of the connector, the first and second threaded portions disengage the threads of the fastener to allow movement of the connector relative to the fastener in the longitudinal direction; and wherein in moving from the non-locking position to the locking position, each threaded portion moves toward the fastener and each actuating portion moves away from the fastener. a fastener configured to couple to a faucet and extend through a support structure of the faucet; and a connector comprising: a base having a longitudinal bore receiving the fastener and a radial bore extending transversely through the longitudinal bore; and a nut assembly disposed in the radial bore and around the fastener, wherein the nut assembly includes a first locking member, which has a first threaded portion and a first actuating portion disposed on opposite sides of the fastener, and a second locking member, which has a second threaded portion and a second actuating portion disposed on opposite sides of the fastener; a base having a longitudinal bore receiving the fastener and a radial bore extending transversely through the longitudinal bore; and a nut assembly disposed in the radial bore and around the fastener, wherein the nut assembly includes a first locking member, which has a first threaded portion and a first actuating portion disposed on opposite sides of the fastener, and a second locking member, which has a second threaded portion and a second actuating portion disposed on opposite sides of the fastener; wherein in a locking position of the connector, the first and second threaded portions engage threads of the fastener to prohibit relative sliding movement between the connector and the fastener in a longitudinal direction while allowing the connector to rotate along the threads of the fastener; wherein in a non-locking position of the connector, the first and second threaded portions disengage the threads of the fastener to allow movement of the connector relative to the fastener in the longitudinal direction; and wherein in moving from the non-locking position to the locking position, each threaded portion moves toward the fastener and each actuating portion moves away from the fastener.