A TO Z MAGNET

These tolerances apply for low and high quantity magnets. For larger magnets +/-0.1mm tolerances may be perfectly acceptable but for very small magnets this could be more problematic particularly in sensitive applications such as, for example, sensors (as size variations may cause a variation in magnetic output from magnet to magnet).

The standard production procedure requires randomly selected samples from each production batch to be measured for dimensional accuracy (amongst other quality control checks); statistical analysis determines whether the magnets in each batch will all fall within tolerance (sometimes a batch may be 100% inspected).

Where tighter dimensional tolerances are required, 100% testing is more likely to be the only reliable method of testing - only the magnets that pass the tolerance requirements are retained and the remainder would be scrapped for recycling.

This can lower the yield to the point where either the process is not cost effective which is why +/-0.05mm is usually the minimum tolerance range) or the high scrap rate plus additional testing costs is reflected in an increase in cost per magnet.