The Mitsubishi HG-KR13(B)G1 1/20 is a 100 W servo motor from the HG-KR series, paired with a 1/20 nominal reduction ratio gearbox. This is a current-production unit, so the BOM line stays stable for the foreseeable future — no PCN watch needed for this order code.
The permissible radial load of 370 N and thrust load of 450 N define the maximum overhung load the output shaft can sustain without bearing life degradation. If your application couples a timing pulley or rack-and-pinion directly to the shaft, those are the numbers that govern — exceed them and the bearing race will spall, provided the load cycle is continuous. The brake static friction torque of 0.32 N·m holds the vertical axis at rest when power is removed, sized for the reflected load through the 1/20 reduction.