Autistic individuals often experience challenges in social communication and interaction, and there is growing evidence that specific interests can help them regulate these difficulties. However, it is unclear what specific properties of these interests make them suitable for this role. In this qualitative study, we conducted semi-structured interviews with nine autistic individuals to explore the social functions of their specific interests. Data analysis followed Grounded Theory and Interpretative Phenomenological Analysis principles. Our analysis revealed that these interests have two important functions in social communication and interaction. On one hand, they provide a means of disconnecting from the often-distressing challenges in the social outside world. On the other hand, specific interests serve as a social compass: they provide structure and meaning to social reality, can foster a sense of connection with others, and provide an entryway for social participation. Based on these findings, we propose a conceptual model suggesting that specific interests enhance the experience of a psychological boundary between oneself and others, which contributes to a sense of safety during social interactions. Our study suggests that incorporating specific interests into therapeutic interventions can improve the social communication and interaction of autistic individuals, without losing sight of their personal well-being.