When sourcing axis robots, you must prioritize Payload Capacity and Reach. Ensure the robot can handle at least 20% more than your maximum intended load to prevent motor strain. Additionally, verify the Repeatability (precision) levels; for high-precision electronics assembly, a repeatability of ±0.02mm is standard, while for palletizing, ±0.1mm may suffice. Don't forget to check the Degree of Freedom (DoF)—6-axis robots offer maximum flexibility for complex paths, whereas 4-axis SCARA robots are more cost-effective for high-speed pick-and-place tasks.