Optical fiber connector assemblies. The connectors comprise plug bodies having two cantilevered beams disposed in a rear interior portion of the plug body and a ferrule which houses an optical fiber that is front-loaded into the plug body and which is adapted to bias the two cantilevered beams when placed in the plug body such that the plug body snaps around the plug member to captivate the ferrule member in the optical fiber connector. The connector is further comprised of a spring placed axially in the plug body for spring-loading the ferrule member in the plug body, and a rear housing adapted to receive the rear portion of the ferrule member when the ferrule member is placed in the plug body. The optical fiber connectors which are described herein ensure precise optical alignment of optical waveguides in the connector and are simple to assemble.