The SMBN0400 countersunk neodymium magnet is made from high performance N42 NdFeB, with Nickel coating. The dimension of this item is 1/4" × 1/4" × 1/4" (- 1/16" hole), magnetized through thickness, with the tolerance of ±0.004" × ±0.004" × ±0.004". The weight of this super strong neodymium magnet is 0.00425 lbs. It can pull up to 4.05 lbs steel. And the surface field is up to 4045 gausses.
Download a PDF Specification Sheet