1.The pulling force will maximize when pulling from vertical direction with magnets surface.
2.The Pulling Force will be influenced by many factors: the material of the stuff, effective contact area, the smoothness of the surface, pull direction, temperatures, material type, thickness, flatness, friction levels, etc), its quality (e.g. rust free), its size (thickness plus total surface area), etc.
Size: D48mm --50-70KG
Size: D60mm --112-150KG
Size: D75mm --160-200KG
Size: D90mm --250-300KG
Ordinary neodymium magnets only use one side of their magnetic field to stick to metal which means they’re only using half of their available strength. However,if add a steel cup, the other pole of the magnet to be used which increases the strength of the magnet to much higher than that of a normal neodymium magnet. At the same time, the steel cup also protects the magnet from being damaged when frequently used, but also makes the other side magnetically weak.
If the highest possible pull force is required, then neodymium cup magnets are the answer to your magnet needs
Strong magnets may interfere with the operation of pacemakers.
Strong magnets should be kept away from Ironware and some easily magnetized iron products, such as monitors, bank cards, computers, televisions.
Strong magnets might affect water meter, electric meter, gas meter and some metering equipment.
Strong magnet should keep away from kids, If magnet damaged please dispose of shards completely. They are still magnetized and will cause serious problem if swallowed by children.
The large neodymium magnets are extremely strong, and must be handled with care to avoid personal injury and damage to the magnets. Fingers and other body parts can get severely pinched between two attracting magnets. It is easy broken,please be careful.
Never place neodymium magnets near electronics
Neodymium magnets are brittle, and can peel, crack or shatter if allowed to slam together.
Neodymium magnets will lose their magnetic properties if heated above 80°C/176°F.