Seatbelt clamping device and system

A seatbelt clamping device includes a U shaped housing configured for being mounted to vehicle structure and a shackle that is pivotally attached to the housing. The shackle can pivot between an open position for receiving a loop of seatbelt webbing and a closed position for retaining the seatbelt webbing. The housing includes a locking surface, and the shackle and locking surface define a gap therebetween through which the seatbelt webbing can slide. The shackle includes a shaft and a cam cover rotatable about the shaft. The cam cover includes an increased radius locking portion that can rotate toward the locking surface to clamp the seatbelt webbing in response to a load exerted thereon.