Product Introduction:
The 8-604-A-21 is a frameless brushless DC motor from Kollmorgen's 8-Series product line, designed for high-performance direct-drive applications. The "604" indicates a 60 mm outer diameter stator with a 40 mm inner bore (or 4 mm wall thickness variant — exact bore depends on sub-configuration). The "A" specifies the winding type, and "21" defines the feedback and connector configuration. This motor delivers high continuous torque in a compact, frameless package suitable for robotics, aerospace, and precision positioning.