When sourcing Fuma casters, the most critical factor is the Load Capacity. You must calculate the total weight of your equipment plus a 25% safety margin, as floors are rarely perfectly level, often leaving only three casters to bear the weight. Look for high-strength die-cast aluminum bodies for durability and NBR (Nitrile Butadiene Rubber) leveling pads to ensure vibration damping and anti-slip performance. Additionally, verify the swivel radius and top plate dimensions to ensure compatibility with your machine's base.