This study examined glass fiber-reinforced polymer (GFRP) members manufactured using the hand lay-up method, focusing on tensile experiments of one-row, two-column, high-strength bolted friction joints in coupon-type specimens, using parameters such as plate thickness and laminate configuration. The aim of this study was to elucidate the slipping and ultimate behaviors and investigate the failure modes. The results indicated that increasing the parent plate thickness enhanced the slipping resistance. Moreover, while reducing the thickness of the connecting plate increased the contact pressure, it decreased the range of the pressure influence, resulting in a lower slip coefficient. Additionally, a comparison between hand lay-up GFRP joints and pultruded GFRP joints revealed that the pultruded GFRP exhibited greater slipping resistance.