A fiber optic connector terminates a drop cable. A connector housing can include a back post where the drop cable to enters the housing. A cable clamp insert is least partially received in the back post. The cable clamp insert defines a passage for receiving the drop cable. A crimp ring is crimped onto the back post to secure the cable clamp insert to the housing and clamp the cable clamp insert onto the drop cable. Fiber optic connectors can also have a cable clamp insert and a cable clamp retainer that couples to the rear end portion of the housing whereby the cable clamp retainer pushes the cable clamp insert forward in the housing and applies an increasing force to create a tight connection between the housing and the cable clamp insert.