Linear Motor NdFeB Magnet is your good choice.Recently I have encountered many customers who are not sure what magnetic grade they want. In fact, these can be roughly calculated. As long as the mass of the neodymium iron boron magnet is calculated, the approximate magnetic force can be inferred. Formula for calculating the mass of rare earth neodymium iron boron magnets.

The formula for calculating the weight of a square magnet, the magnet density of different materials is different, here the density of neodymium iron boron is calculated as 7.5.

The calculation formula is: volume * density ÷ 1000 = weight (g), the following are several common shapes

1. The formula for calculating the weight of a square neodymium iron boron magnet:

For example, F15*15*5 of this size

The calculation formula is: 15*15*5*7.5 / 1000≈8.4g.

2. The calculation formula for the weight of a round neodymium iron boron magnet:

Such as: the specification diameter is 20mm, the thickness is 5mm

The calculation formula is: 7.5*3.14*20²*5/4000=11.775g

3. Calculation formula for the weight of ring-shaped neodymium iron boron magnet:

π*(a + b)(a-b)* thickness* density/ 4000 (where a and b represent the outer and inner diameters of the ring, respectively)

For example, the outer diameter is 20mm, the inner diameter is 10mm, and the thickness is 3mm

The calculation formula is: 3.14 * (20 + 10) * (20-10) * 3*7.5 /4000≈5.3g Linear Motor NdFeB Magnet is your good choice.