Neodymium Magnets on Vertical Surfaces: Why Pull Force Is Not the Hanging Load
A magnet with a published pull-force value may still slide when it holds an object against a vertical steel surface. Selecting magnets for a sign, removable panel or bracket therefore starts with the actual load direction and contact arrangement. The direct-pull number alone does not establish an allowable hanging load.
Separate pulling away from sliding down
A direct pull test separates the magnet from its target. On a broad vertical steel surface, resistance to downward sliding depends strongly on friction at the contact. The two conditions are different, so a pull-force rating should not be relabelled as the weight the assembly can support.
Describe whether the product must resist sliding, direct separation, rotation or a combination. Give the product engineer enough information to define the relevant acceptance test for the intended mounting.
Specify the contact surface
Identify the steel target, its thickness and finish, and any paint, film or protective layer between it and the magnet. Include the expected cleanliness and surface condition. A trial on an unrelated workshop plate may not represent the finished product's mounting surface.
A higher-friction interface can improve sliding resistance, but an added layer also increases separation from the steel and can reduce magnetic attraction. Review both effects in the actual assembly rather than applying a universal percentage of the catalogue pull force.
Show where the load acts
Provide a side view of the bracket or mounted object. Show how far the load extends from the steel face and how the magnets are arranged. An offset load can create a turning action that tends to lift an edge away from the target.
Include any guides, stops or other mechanical features that contribute to the mounting. The assembly drawing should make clear which features locate the object and which are intended to resist movement.
Test the complete mounting
Use representative magnets, housings, target surfaces and load positions for sample evaluation. Agree the load, duration, movement or vibration conditions, and acceptance criteria with the responsible product team. Record any sliding, rotation, separation or movement within the magnet mounting.
Keep the test configuration with the approved drawing and sample reference. A change to the contact pad, target finish or bracket geometry should remain visible for review rather than being treated as an unrelated cosmetic revision.
Prepare a useful magnet inquiry
Send XILAI the assembly drawing, target material and finish, working gap, load direction and position, mounting method and operating conditions. Include the desired function and any existing test result. These details help the supplier discuss candidate neodymium magnets while the product team verifies the complete vertical mounting.