Long fiber thermoplastic composite (LFT) has been mainly used in conventional applications such as automotive because of its low cost, great specific mechanical properties, excellent impact performance, excellent corrosion resistance and ease of processibility. All of these great properties enable it a potential material candidate in unconventional applications such as offshore gas and oil drilling. This work focuses on the design optimization, prototyping, and testing of a long glass fiber reinforced polyamide 66 (glass/PA66) stop collar for stabilizing buoyancy modules on a drill pipe for offshore gas and oil drilling application. Solid model is created using CREO and structural models are constructed using ANSYS Workbench with proper boundary and loading conditions. The material properties obtained from previous material studies are used for the modeling input and geometry design is optimized to achieve the required safety factor. The glass/PA66 stop collar is then prototyped using extrusion compression molding process. The performance of the LFT stop collars is finally validated with a slip testing and a successful practical run in a drilling operation.