Prevention of catastrophic effects due to fuel vapor ignition is a key part of any aircraft certification effort. One potential fuel vapor ignition source is arcing and sparking resulting from lightning currents conducted through airframe components, such as fasteners and joints. The most common method of demonstrating adequate ignition source prevention involves extensive testing of a large variety of fasteners and fastener configurations. Fastener test levels are based on current densities distributed throughout the aircraft, obtained through full-vehicle lightning testing and simulation. The fastener design handbook [4] contains a sample of the testing and simulation effort used to identify potential ignition sources in fuel tanks. Findings and data published in the project reports handbook serve as baseline engineering evaluation for industry to reduce the overall quantity of tests required during the fuel tank design process. Several factors were studied for their impact on fastener non-sparking thresholds. There are three phases associated with this study. Phase 1 of this project focused on developing a public fastener database for non-sparking thresholds due to conducted lightning currents in coupon level tests representing metal fuel tanks. This included both nominal and faulted fastener installations. Phase 2 involved the development of a metal fuel tank lightning design handbook and was carried out by EMA. The focus of this phase was to demonstrate how lightning environments could be established in aircraft fuel systems using validated numerical simulations. Phase 3 of this project focused on developing a public fastener database for lightning non-sparking thresholds in coupon level tests in carbon fiber reinforced plastic (CFRP) fuel tanks for both nominal and faulted fastener installations. This paper provides the background for the project, findings of each phase of this study, and opportunities for future work. All work done during this project is publically available to be used as a design guide. This project was funded by KART grants and done in partnership with EMA.