Fiber reinforced polymers (FRP) have been recently used in retrofitting and strengthening of existing steel structures. Pervious researches indicated that bonding FRP composites to steel elements is associated with undesirable brittle failure of the adhesive at the FRP-steel interface. An emerging strengthening technique, which involves attaching hybrid fiber reinforced polymer (HFRP) composites to steel elements using steel bolts, has proven its efficiency in rehabilitating steel structures. This study investigates the structural behavior of HFRP-steel joints with FRP bolts. An experimental program was conducted on twenty double-lap HFRP-steel joints with different bolt diameters and sheared edge distances. The findings revealed insignificant effect of the sheared edge distance on the joint response. Increasing the bolt diameter enhanced the load carrying capacity of the bolted joints significantly. Experimental outcomes suggested using FRP bolts with 13 mm diameter to connect the HFRP laminates to steel plates while maintaining a sheared edge distance that is three times the bolt-hole diameter. For the particular configurations tested in this study, a simplified nonlinear load-slip model was developed to describe the interfacial behavior of the HFRP-steel joints formed using FRP bolts. The model was then compared to a previously developed load-slip relationship for HFRP-steel joints that use steel bolts.