About Neodymium Magnets
How Do I Tell If a Magnet Is N52 or Just Labeled That Way?
You can't see grade. Measure the size, compare pull and gauss with a known N52 of the same size, and watch for physically impossible claims.
Amazon vs. Industrial-Grade Neodymium Magnets: What's the Difference?
The difference is the specification. Industrial-grade magnets come with a stated grade, tolerances, tested pull force, coating details and documentation.
Why Is a Pot Magnet Stronger Than a Bare Magnet the Same Size?
The steel cup brings both poles to the face and concentrates the field. The advantage is biggest in direct contact with thick, flat steel.
Does Steel Thickness Affect Magnet Strength?
Yes. Thin steel fills up with field and the magnet holds less. Small magnets do fine on thin sheet; large ones need 2 to 4 mm of steel.
Does a Magnet With 20 lbs of Pull Force Actually Hold 20 lbs?
Not necessarily. The rating is a straight pull off thick steel. On a wall, thin steel or through a gap, a magnet holds much less.