Dowel, spring, and taper pins are types of fasteners used in mechanical applications. Dowel pins are cylindrical rods that ensure precise alignment of components. Spring pins, also known as roll pins, feature a split design for flexibility, providing a self-retaining and resilient fastening solution. Taper pins have a conical shape and are utilized to secure parts in a tapered hole, providing a tight fit. These pins collectively contribute to efficient assembly and alignment in various machinery, enabling sturdy connections and preventing relative movement between interconnected components.